doc,src,test: fix dead inspector help URL

[semimikoh]

The inspector help message pointed to https://nodejs.org/en/docs/inspector
which returns a 404. Updated to https://nodejs.org/api/inspector.html.

• src: update URL in inspector_socket_server.cc
• doc: update example output in inspector.md and debugger.md
• test: update response pattern in test-inspector-help-page.js

Fixes: #62743

[nodejs-github-bot]

Review requested:

• @nodejs/inspector

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.69%. Comparing base (d080801) to head (2a6b732).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #62745      +/-   ##
==========================================
- Coverage   91.55%   89.69%   -1.87%     
==========================================
  Files         355      706     +351     
  Lines      149381   218127   +68746     
  Branches    23364    41740   +18376     
==========================================
+ Hits       136765   195644   +58879     
- Misses      12354    14402    +2048     
- Partials      262     8081    +7819     

Files with missing lines	Coverage Δ
src/inspector_socket_server.cc	84.23% <100.00%> (ø)

... and 472 files with indirect coverage changes

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