CI: Doc build failing
Raw log: https://pipelines.actions.githubusercontent.com/xZyE9jtmkxWlfCAbyu1SHPJOlsa2huNFYcxohSTomy6EbdNZT9/_apis/pipelines/1/runs/25615/signedlogcontent/5?urlExpires=2020-04-06T15%3A02%3A02.2235397Z&urlSigningMethod=HMACV1&urlSignature=eEVJM7I2bg9PFf1apMIamBRrB1gG01K%2F12iKl%2Fe%2Bp5k%3D

```
2020-04-06T13:50:55.3962303Z looking for now-outdated files... none found
2020-04-06T13:50:55.6426712Z pickling environment... done
2020-04-06T13:50:55.6437496Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.BDay.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6440109Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.BMonthBegin.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6440725Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.BMonthEnd.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6441280Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.BQuarterBegin.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6441822Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.BQuarterEnd.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6442356Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.BYearBegin.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6442955Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.BYearEnd.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6443493Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.BusinessDay.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6444257Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.BusinessHour.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6444841Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.BusinessMonthBegin.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6445386Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.BusinessMonthEnd.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6445944Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.CBMonthBegin.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6448129Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.CBMonthEnd.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6448680Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.CDay.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6449227Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.CustomBusinessDay.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6449763Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.CustomBusinessHour.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6450302Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.CustomBusinessMonthBegin.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6450916Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.CustomBusinessMonthEnd.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6451574Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.DateOffset.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6453847Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.Day.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6456375Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.Easter.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6456758Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.FY5253.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6457151Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.FY5253Quarter.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6457538Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.Hour.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6465081Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.LastWeekOfMonth.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6465522Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.Micro.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6465912Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.Milli.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6466283Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.Minute.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6466680Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.MonthBegin.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6467071Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.MonthEnd.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6467648Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.MonthOffset.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6468033Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.Nano.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6468754Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.QuarterBegin.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6468876Z checking consistency... done
2020-04-06T13:50:55.6476990Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.QuarterEnd.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6477700Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.QuarterOffset.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6478266Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.Second.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6478810Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.SemiMonthBegin.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6479349Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.SemiMonthEnd.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6524416Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.SemiMonthOffset.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6525343Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.Tick.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6526474Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.Week.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6529160Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.WeekOfMonth.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6529727Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.YearBegin.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6530263Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.YearEnd.__call__.rst: WARNING: document isn't included in any toctree
2020-04-06T13:50:55.6530778Z /home/runner/work/pandas/pandas/doc/source/reference/api/pandas.tseries.offsets.YearOffset.__call__.rst: WARNING: document isn't included in any toctree
```