doc: finish cleaning up *Note* tags
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines
Refs: https://github.com/nodejs/node/pull/18592
Edit: added second commit clearing Man page doc: remove notice of dashes in V8 options
Previously only V8 options supported both dashes in them (making them equivalent), but now Node.js also supports both styles so the note can be removed.