Merge branch 'jc/maint-checkout-fileglob-doc'

Updated with help from Peff.

* jc/maint-checkout-fileglob-doc:
gitcli: contrast wildcard given to shell and to git
gitcli: formatting fix
Document file-glob for "git checkout -- '*.c'"

diff --cc Documentation/git-checkout.txt
Simple merge

diff --cc Documentation/gitcli.txt
Simple merge