Documentation: fix broken linkgit to git-config

Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/githooks.txt

diff --git a/Documentation/githooks.txt b/Documentation/githooks.txt
index 7ba0ac9..a2f59b1 100644
--- a/Documentation/githooks.txt
+++ b/Documentation/githooks.txt
@@ -397,7 +397,7 @@
 'extra-info'.
 
 The hook always runs after the automatic note copying (see
-"notes.rewrite.<command>" in linkgit:git-config.txt[1]) has happened, and
+"notes.rewrite.<command>" in linkgit:git-config[1]) has happened, and
 thus has access to these notes.
 
 The following command-specific comments apply: