DOC: Update the usage of rtol and atol arguments
 Update the usage of `rtol` and `atol` arguments in `pd.testing.assert_frame_equal`

- [x] closes #59344
- [x] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
Thanks @tan-i-ham 