Merge branch 'pa/cherry-pick-doc-typo'

"git cherry-pick --help" had three instances of word "behavior",
one of which was spelled "behaviour", which is updated to match the
other two.

* pa/cherry-pick-doc-typo:
  git-cherry-pick.txt: correct a small typo

Documentation/git-cherry-pick.txt

@@ -128,7 +128,7 @@ effect to your index in a row.
 
 --allow-empty-message::
 	By default, cherry-picking a commit with an empty message will fail.
-	This option overrides that behaviour, allowing commits with empty
+	This option overrides that behavior, allowing commits with empty
 	messages to be cherry picked.
 
 --keep-redundant-commits::