doc: fix 'git status --help' character quoting

Correct backtick quoting for some of the modification states to give
consistent web rendering.

Signed-off-by: Philip Oakley <philipoakley@iee.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Merge branch 'po/doc-status-markup' into pu

* po/doc-status-markup:
  doc: fix 'git status --help' character quoting
core.filemode may need manual action

core.filemode is set automatically when a repo is created.
But when a repo is exported via CIFS or cygwin is mixed with Git for Windows
or Eclipse core.filemode may better be set manually to false.
Update and improve the documentation

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Merge branch 'tb/core-filemode-doc' into pu

* tb/core-filemode-doc:
  core.filemode may need manual action