Update tutorial information for the 'm' and 'a' screens.

Space allowing, differentiate between hydras with different numbers of heads in the monster list. (This is probably only interesting in the Swamp.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5993 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on June 19, 2008
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