Suggested Improvement in how=left/inner parameter explanation
- [x] Address Issue #53157
-- [ ] Pre commit checks passed 
- [x]  Contribution is made to pandas/core/frame.py
Suggestion to improve the wording for merge(), specifically the "how" parameter. I only made the changes to the left and inner arguments and will make changes to the other bullets if suggestion is worth pursuing. 
Currently working on failed tests.  Thanks for the pull request, but based on the discussion in the issue, it doesn't appear that this is just a documentation issue and there might be bug. I think we should wait until the discussion is resolved there. Going to close this PR for now but happy to have your contribution on other issues labeled `good first issue`