Add a minor documentation fix: the racial modifier for elves is elven,

not elvish.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3056 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on December 13, 2007
EEGB5CVVX7AKKQBWAAUNXU56Z47LSIC2PZRQBFGS7ML5T4O5F52AC
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