[doc PATCH] expand attribute aligned and __alignof__

[Martin Sebor]

The manual doesn't document the effects of attribute aligned
with no argument.  The __alignof__ section also doesn't discuss
the effect of the operator on functions, and doesn't mention
that it's okay to use void as an argument.

The attached patch adds entries for the attribute form with no
argument and text describing its effects, plus a description of
__alignof__ with functions and void.

Martin
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