"git check-ref-format --branch $name" feature was originally
introduced (and was advertised) as a way for scripts to take any
end-user supplied string (like "master", "@{-1}" etc.) and see if it
is usable when Git expects to see a branch name, and also obtain the
concrete branch name that the at-mark magic expands to.

Emphasize that "see if it is usable" role in the description and
clarify that the @{...} expansion only occurs when run from within a
repository.

[jn: split out from a larger patch]

Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Signed-off-by: Junio C Hamano <gitster@pobox.com>

Doc update.

* ah/doc-pretty-color-auto-prefix:
  doc: clarify syntax for %C(auto,...) in pretty formats

An example in documentation that does not work in multi worktree
configuration has been corrected.

* ah/doc-gitattributes-empty-index:
  doc: do not use `rm .git/index` when normalizing line endings

Signed-off-by: Junio C Hamano <gitster@pobox.com>

Doc update.

* sn/reset-doc-typofix:
  doc: git-reset: fix a trivial typo

Doc update.

* sg/doc-pretty-formats:
  docs/pretty-formats: stress that %- removes all preceding line-feeds

Doc update to a recently graduated topic.

* sb/submodule-rm-absorb:
  Documentation/git-rm: correct submodule description

The manual correctly describes the syntax with `auto,` but the
trailing `,` is hard to spot in a terminal.  The HTML format does not
have this problem.  Adding an example helps both worlds.

Signed-off-by: Andreas Heiduk <asheiduk@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>