DOC: fix PR02,SA01,ES01 for pandas.tseries.offsets.BDay and pandas.tseries.offsets.BusinessDay
fixes

```
pandas.tseries.offsets.BDay PR02,SA01,ES01
pandas.tseries.offsets.BusinessDay PR02,SA01,ES01
```
thanks @tuhinsharma121 - looks like there's a warning?
```
docstring of pandas._libs.tslibs.offsets.BusinessDay:12: WARNING: autosummary: stub file not found 'pandas.tseries.offsets.BusinessDay.offset'. Check your autosummary_generate setting.
``` @MarcoGorelli  I guess I need to add stub file for 'pandas.tseries.offsets.BusinessDay.offset'. But I am not sure how/where to add that. I believe it has something to do with `doc/source/reference` but I dont know how to proceed. If you can guide me that would be great.  i don't know off the top of my head sorry, perhaps try to look at similar classes? This pull request is stale because it has been open for thirty days with no activity. Please [update](https://pandas.pydata.org/pandas-docs/stable/development/contributing.html#updating-your-pull-request) and respond to this comment if you're still interested in working on this. Thanks for the pull request, but it appears to have gone stale. If interested in continuing, please merge in the main branch, address any review comments and/or failing tests, and we can reopen.