Merge branch 'kh/notes-doc-fixes'

"git notes --help" documentation updates.

* kh/notes-doc-fixes:
  doc: notes: use stuck form throughout
  doc: notes: treat --stdin equally between copy/remove
  doc: notes: point out copy --stdin use with argv
  doc: notes: clearly state that --stripspace is the default
  doc: notes: remove stripspace discussion from other options
  doc: notes: rework --[no-]stripspace
  doc: notes: split out options with negated forms
  doc: config: mention core.commentChar on commit.cleanup
  doc: stripspace: mention where the default comes from