doc: update library generation howto to use module path

[scotthart]

This PR updates the find target path to look in the module directory for googleapis.

[gemini-code-assist]

Summary of Changes

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This pull request updates the documentation for generating libraries, specifically correcting a path in a find command example. This ensures that contributors follow the correct procedure when identifying .proto files within the googleapis module directory.

Highlights

• Documentation Update: The howto-guide-adding-generated-libraries.md file has been updated to correct the find command's path for locating .proto files, changing googleapis~ to googleapis+.

Changelog

• doc/contributor/howto-guide-adding-generated-libraries.md
  • Updated the find command path from googleapis~ to googleapis+.

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[gemini-code-assist]

Code Review

This pull request updates a command in the contributor's guide for adding generated libraries. The change replaces the WORKSPACE-style path (googleapis~) with a module-style path (googleapis+) for locating googleapis in the bazel output base. This aligns the find command with other generator-related commands in the document that also use the module path. The change appears correct and consistent with the likely move towards using bzlmod for parts of the generation process. I have no further comments.

_{Note: Security Review has been skipped due to the limited scope of the PR.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.64%. Comparing base (eea3715) to head (ba1bad0).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16034      +/-   ##
==========================================
- Coverage   92.64%   92.64%   -0.01%     
==========================================
  Files        2335     2335              
  Lines      214792   214792              
==========================================
- Hits       198986   198985       -1     
- Misses      15806    15807       +1     

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