fixed typo in readme, thanks Dominic Rodger

Author: Simon Willison

README.rst

@@ -74,7 +74,7 @@ This tag is included for completeness. Authors of reusable apps which ship
 with their own templates (extending base.html) might want to ensure that their 
 apps use the correct markup for the current doctype. In practise, this means 
 outputting a self-closing tag for a small number of HTML elements. The 
-`{% slash %}` tag simply outputs the string "/ " for an XHTML doctype and 
+`{% slash %}` tag simply outputs the string " /" for an XHTML doctype and 
 renders blank for an HTML doctype. Here are some examples::
 
     <br{% slash %}>