Updated syndication framework porting notes.
Updated syndication framework porting notes.

This is based on some experience porting older code and trying to work
out why my feed content was empty.

git-svn-id: 4f9f921b081c523744c7bf24d959a0db39629563@12742 bcc190cf-cafb-0310-a4f2-bffc1f526a37

t11e/django,t11e/django,t11e/django