DOC: Fix diction: "e.g." -> "i.e."
"e.g." means "for example", "i.e." means "that is"

- ~~[ ] closes #xxxx (Replace xxxx with the GitHub issue number)~~
- ~~[ ] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature~~
- ~~[ ] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).~~
- ~~[ ] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.~~
- ~~[ ] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.~~

Thanks @wjandrea 