Fixed asciidoc syntax.

docs/release-notes/release-notes-1.1.txt

@@ -7,7 +7,7 @@ focused on adding security support to Hue, matching the security
 support of Cloudera's Distribution for Hadoop 3, beta 3.
 
 Notable Changes and Caveats
-===========================
+---------------------------
 * Hue 1.1 only works with CDH3b3 or newer.  CDH2 and earlier betas of CDH3
 will not work.
 * The default port for the namenode plugins has changed from 9090 to 10090.