Minor edits to Conversions to make me more comfortable
Minor edits to Conversions to make me more comfortable

Removed mention of exceptions even from future section, just left
vague what would go wrong.

Also, removed future regarding string->enum conversion because
it actually does work today (and generates a runtime error if
there's no match).




git-svn-id: 88467cb1fb04b8a755be7e1ee1026be4190196ef@18694 3a8e244f-b0f2-452b-bcba-4c88e055c3ca

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