Update cheatsheet

[KeeratKG]

This PR contributes the following items to the cheatsheet:

• List of frequently used options shown here: https://pandas.pydata.org/pandas-docs/stable/user_guide/options.html#frequently-used-options
• I/O: A whole section showing a variety of popular IO usage (CSV, Excel, SQL, HTML), and also output file formats (feather, parquet, HDF)
• An Apply Functions section
• pd.NA
  Will make further additions based on review by maintainers.

[MichaelTiemannOSC]

There are two typos on the first page and what I think is a major error on the last.

1. In the leftmost Creating DataFrames column, the lower figure mislabels the row labeled 'd' as being labeled 'D'
2. In the lower-right Subsets box, the explanation that df.iloc[10:20] is wrong. It does not select rows 10-20, but the ten rows labeled 10-19.

As for the major error, it concerns the explanation of apply. When doing apply with axis=1, it means work row-by-row, exposing the columns. So axis=1 should show a horizontal hlghlight, not a vertical highlight. The axis=0 is similarly wrong.

[KeeratKG]

@MichaelTiemannOSC thank you for the feedback and sorry for the delay in getting back! Will address these asap.

[github-actions]

This pull request is stale because it has been open for thirty days with no activity. Please update and respond to this comment if you're still interested in working on this.

[mroeschke]

Thanks for the pull request, but this PR appears to be stale. Additionally it appears #43036 must be addressed first before other cheat sheet changes so closing.

Happy to have other pull requests with the label good first issue