DOC BUG API Reference documentation truncated for Series.unstack(), Series.
The [API Reference documentation for `Series`](https://pandas.pydata.org/pandas-docs/stable/reference/series.html) and [`DataFrame`](https://pandas.pydata.org/pandas-docs/stable/reference/frame.html) have truncated documentation strings for `Series.at_time()`, `Series.unstack()`, and `DataFrame.at_time()`. The bug appears to occur where the docstring contains ". " (that is, a period followed by a space). Presumably, this pattern is being used to find the end of the one-line function description.