[alg.random.sample] reword and add cross-reference #705
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MeowIterator is not a named requirement, so reworded as "shall satisfy
the requirements of a meow iterator", consistent with the wording in
[algorithm.general]/5. Added cross-references to [meow.iterators], and
to [iterator.requirements.general] for "writable".
Partially addresses #697 and #696.