DOC: Link pandas.merge API page to User Guide (:ref:merging)

[manikrishna-m]

Summary

Adds a cross-link from the pandas.merge API reference (See also section) to the User Guide section :ref:merging`` (“Merge, join, concatenate and compare”) to improve discoverability for new users.

What’s changed

• Edit: pandas/core/reshape/merge.py
  • In the merge docstring’s See also block, add:
    :ref:merging : User Guide on merging, joining, concatenating, and comparing.

Rationale

The API page currently lists related functions but not the tutorial-style User Guide page. Adding the :ref:merging`` link makes it easier to jump from API to the relevant guide.

Notes

• Docs-only change; no API/behavior changes.
• No whatsnew entry needed.
• If maintainers prefer, I can follow up with similar links for DataFrame.join and related functions.

[mroeschke]

Thanks for the PR, but we don't accept AI generated pull requests and it appears this PR isn't associated with an open issue so closing