gitk.txt: Fix markup.

For the manpage, avoid generating an em dash in code.

Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

Documentation/gitk.txt

diff --git a/Documentation/gitk.txt b/Documentation/gitk.txt
index e9f82b9..8dbfb0d 100644
--- a/Documentation/gitk.txt
+++ b/Documentation/gitk.txt
@@ -69,7 +69,7 @@
 	The "--" is necessary to avoid confusion with the *branch* named
 	'gitk'
 
-gitk --max-count=100 --all -- Makefile::
+gitk --max-count=100 --all \-- Makefile::
 
 	Show at most 100 changes made to the file 'Makefile'. Instead of only
 	looking for changes in the current branch look in all branches.