Unify modelines in Asciidoc files

This gets us close to using the same modeline in all files we run
through Asciidoc, as well as adding the spell and spelllang
declarations, just as we had in NEWS already.

The choice of 'en_us' is mainly for consistency and because the body of
work already uses these spellings.

Signed-off-by: Dan McGee <dan@archlinux.org>

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