minor bug fix in rss.xml

git-svn-id: http://emacspeak.googlecode.com/svn/trunk@8879 bb5eec90-091a-0410-bc89-db79c2cf2c7b
git-svn-id: http://emacspeak.googlecode.com/svn/trunk@8880 bb5eec90-091a-0410-bc89-db79c2cf2c7b