doc/gitk: s/sticked/stuck/

The terminology was changed in b0d12fc9b23a (Use the word 'stuck'
instead of 'sticked').

Signed-off-by: Štěpán Němec <stepnem@smrk.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/gitk.txt b/Documentation/gitk.txt
index d50e9ed..c2213bb 100644
--- a/Documentation/gitk.txt
+++ b/Documentation/gitk.txt
@@ -26,7 +26,7 @@
 gitk-specific options.
 
 gitk generally only understands options with arguments in the
-'sticked' form (see linkgit:gitcli[7]) due to limitations in the
+'stuck' form (see linkgit:gitcli[7]) due to limitations in the
 command-line parser.
 
 rev-list options and arguments