Docs: Set correct header level for Change Deleted

Change-Id: I67ad7b82d10cbb9268de8f6830a3984c1e10e760

Documentation/cmd-stream-events.txt

diff --git a/Documentation/cmd-stream-events.txt b/Documentation/cmd-stream-events.txt
index 1ab67d8..e8c5213 100644
--- a/Documentation/cmd-stream-events.txt
+++ b/Documentation/cmd-stream-events.txt
@@ -90,7 +90,7 @@
 eventCreatedOn:: Time in seconds since the UNIX epoch when this event was
 created.
 
-== Change Deleted
+=== Change Deleted
 
 Sent when a change has been deleted.