Documentation: restore a space in unpack-objects usage
Documentation: restore a space in unpack-objects usage

The commit 87b7b84 removed a space in the unpack-objects usage, which
makes the synopsis a bit confusing. This patch simply restores it.

Signed-off-by: Vivien Didelot <8fdc57bfa92d8dfa7873c6f9e93ed744bd3ae60c@savoirfairelinux.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