DOC: sample variance -> population variance (#46482)
- [x] closes #46482 (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 an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

@[mroeschke](https://github.com/mroeschke) sorry i dont understand what you mean.... you mean another pull request?

 > @[mroeschke](https://github.com/mroeschke) sorry i dont understand what you mean.... you mean another pull request?

no what you did is fine thanks @kwhkim 