removed a rst warning

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@5085 d4fa192b-c00b-0410-8231-f00ffab90ce4

doc/sphinx/tutorial/sizing_your_cache.rst

@@ -4,6 +4,7 @@ Sizing your cache
 
 Picking how much memory you should give Varnish can be a tricky
 task. A few things to consider:
+
  * How big is your *hot* data set. For a portal or news site that
    would be the size of the front page with all the stuff on it, and
    the size of all the pages and objects linked from the first page.