dir.c: Fix two minor grammatical errors in comments
dir.c: Fix two minor grammatical errors in comments

Signed-off-by: Allan Caffee <a8ac599518c4917f802b4b8368f5d9f3d5ed5f41@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