Doc: separate gitignore pattern sources
Doc: separate gitignore pattern sources

Use separate bulleted paragraphs for the three different gitignore
pattern sources.

Signed-off-by: Philip Oakley <a0e80625db756b4bd51d5507b8662a7e4f6837ad@iee.org>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git