Change the short description of Divine Vigour to "divinely vigorous"

instead of "divinely robust", as it doesn't affect just HP anymore.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9781 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on May 16, 2009
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