Light copyediting, spell-checking, and spelling normalisation

(eg artifact -> artefact, capitalise race names)

Add documentation on +f to appendix 6; add pointer to appendix in firing section

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3550 c06c8d41-db1a-0410-9941-cceddc491573

Created by  pauldubois  on March 9, 2008
37U62WZZUVEKYMTBNX57ZUUFXHGH5EWS4CGHQO4QXGJIJU4RLBPAC
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