builtin-grep: use external grep when we can take advantage of it

diff --git a/Documentation/git-cat-file.txt b/Documentation/git-cat-file.txt
index 9a7700fa7fae68292dde2e6aa253bcaaebc1793b..504eb1b16a59c5af43fa1206723dece9207ee0eb 100644 (file)
--- a/Documentation/git-cat-file.txt
+++ b/Documentation/git-cat-file.txt
@@ -8,7 +8,7 @@ git-cat-file - Provide content or type information for repository objects
 
 SYNOPSIS
 --------
-'git-cat-file' (-t | -s | -e | <type>) <object>
+'git-cat-file' [-t | -s | -e | <type>] <object>
 
 DESCRIPTION
 -----------