Documentation: tiny git config manual tweaks
Documentation: tiny git config manual tweaks

As a verb, 'setup' is spelled 'set up'.  “diff commands such as
diff-files” scans better without a comma.  Clarify that shallow
and deep are special non-boolean values for format.thread rather
than boolean values with some other name.

Signed-off-by: Jonathan Nieder <b57189c5f2fd5b3daf3350a77fde90def1080fa5@gmail.com>
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