Merge branch 'master' into next

Merge branch 'master' into next

* master:
  Fix trivial typo in git-log man page.
  Properly render asciidoc "callouts" in git man pages.
  Fix up remaining man pages that use asciidoc "callouts".
  Update the git-branch man page to include the "-r" option,
  annotate: display usage information if no filename was given
  annotate: fix warning about uninitialized scalar
  git-am --resolved: more usable error message.