Fix [2644366]: place a space between prefixes and the item name.

Also, fix the documentation which used to say that the prefixes are comma-separated (they're not.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9294 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on February 28, 2009
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