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

diff --git a/Documentation/git-var.txt b/Documentation/git-var.txt
index 90cb157be56cec2ced79b8d6995c999d4d8d0251..a5b1a0dbab5e55a1c1fc2b0f8b35e234832808bb 100644 (file)
--- a/Documentation/git-var.txt
+++ b/Documentation/git-var.txt
@@ -17,7 +17,10 @@ Prints a git logical variable.
 OPTIONS
 -------
 -l::
-       Cause the logical variables to be listed.
+       Cause the logical variables to be listed. In addition, all the
+       variables of the git configuration file .git/config are listed
+       as well. (However, the configuration variables listing functionality
+       is deprecated in favor of `git-repo-config -l`.)
 
 EXAMPLE
 --------
@@ -46,6 +49,7 @@ See Also
 --------
 gitlink:git-commit-tree[1]
 gitlink:git-tag[1]
+gitlink:git-repo-config[1]
 
 Author
 ------