users-guide: Fix various warnings

Authored by bgamari on Sun, Oct 6, 2:50 PM.

Description

users-guide: Fix various warnings

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Marge Bot <ben+marge-bot@smart-cactus.org>Tue, Oct 8, 4:12 AM
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rGHCe9813afceed6: users-guide: Document -XHaskell98 and -XHaskell2010
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Marge Bot <ben+marge-bot@smart-cactus.org> committed rGHCeaeb28a1984e: users-guide: Fix various warnings (authored by bgamari).Tue, Oct 8, 4:12 AM