DOC: Update variables a and b to names consistent with comment documentation
- [x] closes #60366

This PR updates variable names a and b to left_op and right_op across relevant functions to improve code readability and align with the naming conventions described in the documentation. These changes enhance the clarity of the codebase by using descriptive variable names that reflect their role in operations.


1. Updated Function Definitions:
- a → left_op
- b → right_op
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.