Add documentation for status changing action

Change-Id: I5582640760ddebd341a5246a35044235a562827b

src/main/resources/Documentation/config.md

diff --git a/src/main/resources/Documentation/config.md b/src/main/resources/Documentation/config.md
index d949c9d..5f361c2 100644
--- a/src/main/resources/Documentation/config.md
+++ b/src/main/resources/Documentation/config.md
@@ -117,6 +117,12 @@
 
 `<issue-status-action>`
 :	Action to perform on Bugzila issue when all the condition in the stanza are met.
+	<issue-status-action> can be any of:
+	  status STATUS
+	    change the associated bug's status to STATUS, where STATUS can be
+	    any of the values your bugzilla configuration allows as status. Be
+	    aware, that changing a bug from any status for open bugs to a status
+	    for closed bugs will not work, as the resolution would be missing.
 
 `<change-action>`
 :	Action performed on Gerrit change-id, possible values are: