Various documentation tweaks. Among others, replace all references to

"class" with "job", and "race" with "species" because that comes much closer to what they actually are.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9425 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on March 12, 2009
KUB3QPOJTCHHU7TRZKMCAEVJU5BN4J556BHDRJWIL3EEVKNHEN7QC
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