Modernize documentation of .Ao and .Aq.

I looked through our whole tree and failed to find a single use
that is really convincing, except those with .Mt.  Putting it around
character and key names is somewhat widespread and maybe acceptable,
even if hardly useful.

So for now, delete the bogus examples and explain what these macros
are really used for.  Discourage the most common abuses.

Triggered by a question from Raf Czlonka <rczlonka at gmail dot com>.

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