Referencing commits
[The docs ](https://pandas.pydata.org/pandas-docs/stable/contributing.html#committing-your-code) state 
> Please reference the relevant GitHub issues in your commit message using GH1234 or #1234. Either style is fine, but the former is generally preferred

But out of the most recent commits, a majority uses the latter style and a minority use gh-1234. Has the advice changed?