Merge branch 'ja/doc-synopsis-style-again'

A batch of documentation pages has been updated to use the modern
synopsis style.

* ja/doc-synopsis-style-again:
  doc: convert git-imap-send synopsis and options to new style
  doc: convert git-apply synopsis and options to new style
  doc: convert git-am synopsis and options to new style
  doc: convert git-grep synopsis and options to new style
  doc: git bisect: clarify the usage of the synopsis vs actual command
  doc: convert git-bisect to synopsis style