git-filter-branch.txt: fix a typo.

Signed-off-by: Sergei Organov <osv@javad.com>
Acked-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-filter-branch.txt

diff --git a/Documentation/git-filter-branch.txt b/Documentation/git-filter-branch.txt
index ba9b4fb..385ecc9 100644
--- a/Documentation/git-filter-branch.txt
+++ b/Documentation/git-filter-branch.txt
@@ -219,7 +219,7 @@
 	fi' HEAD
 ------------------------------------------------------------------------------
 
-The function 'skip_commits' is defined as follows:
+The function 'skip_commit' is defined as follows:
 
 --------------------------
 skip_commit()