Added note on metal walls grounding. In case the line is too whimsy,

just change it.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3637 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dploog  on March 14, 2008
3BUGKFHPOOH5MBGOTG3VTSK77W7JGP25U3OHYQOHLZVXATD4MOOAC
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