node-api: use Node-API in comments

[vmoroz]

This is a comment-only change that does not affect the actual code.
The PR updates a number of comments and test strings where we still use NAPI and N-API instead of the Node-API.
In some cases, the comments are reflowed by the formatter after the changes.

[nodejs-github-bot]

Review requested:

• @nodejs/node-api
• @nodejs/performance

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.51%. Comparing base (842448b) to head (b6b3d6d).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #61320      +/-   ##
==========================================
+ Coverage   88.00%   88.51%   +0.51%     
==========================================
  Files         704      704              
  Lines      208739   208739              
  Branches    40196    40277      +81     
==========================================
+ Hits       183706   184771    +1065     
+ Misses      16992    15972    -1020     
+ Partials     8041     7996      -45     

Files with missing lines	Coverage Δ
src/js_native_api_v8.cc	76.49% <ø> (ø)
src/js_native_api_v8_internals.h	0.00% <ø> (ø)
src/node_api.cc	75.15% <100.00%> (ø)
src/node_binding.cc	82.74% <ø> (ø)

... and 94 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70737/