Update testing.md

Made TODO one word again.

Update testing.md
5f5609cd · skessler · 34bf0a2f · 5f5609cd
Commit 5f5609cd authored 8 years ago by skessler
--- a/docs/testing.md
+++ b/docs/testing.md
@@ -5,7 +5,7 @@ Testing in CiviCRM is done by a combination of human code review and testing as
 Automated tests
 ---------------

-TO DO:
+TODO:

 * http://wiki.civicrm.org/confluence/display/CRMDOC/Testing