doc: remove synopsis

[avivkeller]

Fixes #59124

• The Usage section is essentially a less detailed version of what's already covered in cli.md#synopsis.
• The Example section closely mirrors the content in the official guide on getting started with Node.js.

[nodejs-github-bot]

Review requested:

• @nodejs/web-infra

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.57%. Comparing base (96c507a) to head (e6e56f8).
⚠️ Report is 1052 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #59216      +/-   ##
==========================================
- Coverage   90.03%   88.57%   -1.47%     
==========================================
  Files         648      704      +56     
  Lines      190986   208123   +17137     
  Branches    37437    40011    +2574     
==========================================
+ Hits       171963   184335   +12372     
- Misses      11638    15812    +4174     
- Partials     7385     7976     +591     

see 316 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/68262/

[avivkeller]

Can the CI be re-ran so this can land?

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/68826/

[avivkeller]

Bump