src: fix dead inspector help URL

[galaxy4276]

Summary

When running node --inspect, Node.js prints:

For help, see: https://nodejs.org/en/docs/inspector

This URL returns 404. Update it to the current location of the
inspector API documentation.

Changes

• src/inspector_socket_server.cc: replace https://nodejs.org/en/docs/inspector
  with https://nodejs.org/api/inspector.html

Fixes: #62743

Test plan

• Run node --inspect -e "" and verify the printed URL is reachable

[nodejs-github-bot]

Review requested:

• @nodejs/inspector

[lpinca]

Duplicate of #62745.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.69%. Comparing base (31b9e60) to head (0cbbca9).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #62802      +/-   ##
==========================================
- Coverage   89.70%   89.69%   -0.01%     
==========================================
  Files         706      706              
  Lines      218288   218288              
  Branches    41782    41782              
==========================================
- Hits       195806   195798       -8     
- Misses      14394    14403       +9     
+ Partials     8088     8087       -1     

Files with missing lines	Coverage Δ
src/inspector_socket_server.cc	84.23% <ø> (ø)

... and 27 files with indirect coverage changes

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[galaxy4276]

Duplicate of #62745.

Thanks