o All of the Q&A entries in this section were i386-specific, so make
these conditional on building for that platform. If
non-i386-platforms need similar Q&A lists, they can add their own to
this file.
o Coalesce the two Q&A sections into one.
o Correct some device names (wd(4) devices have not existed for quite
some time).
o Get rid of a number of obsolete entries (suggested by jhb).
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