lazymanifest: add missing closing parenthesis in comment

lazymanifest: add missing closing parenthesis in comment

--- a/mercurial/manifest.c	Wed Dec 30 17:10:56 2015 +0000
+++ b/mercurial/manifest.c	Thu Dec 31 13:44:59 2015 -0500
@@ -558,7 +558,7 @@
 	(objobjargproc)lazymanifest_setitem,    /* mp_ass_subscript */
 };
 
-/* sequence methods (important or __contains__ builds an iterator */
+/* sequence methods (important or __contains__ builds an iterator) */
 
 static int lazymanifest_contains(lazymanifest *self, PyObject *key)
 {