Add missing word "be" in CL description comments

s/This will displayed/This will be displayed/g

BUG=

Review URL: https://chromiumcodereview.appspot.com/13811053

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@194907 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/git_cl.py b/git_cl.py
index a186029..961a4ab 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -838,7 +838,7 @@
     """Asks the user to update the description."""
     self._description = (
       '# Enter a description of the change.\n'
-      '# This will displayed on the codereview site.\n'
+      '# This will be displayed on the codereview site.\n'
       '# The first line will also be used as the subject of the review.\n'
     ) + self._description