Describe the poison resistance mutation as resistance to poison instead

of immunity, as e.g. Venom Bolt can poison you in spite of it.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10431 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on July 27, 2009
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