Change i386 minimum processor from 486 to 586, and also exclude Quark

We accidentally stopped supporting 486 processors in squeeze.  Update
the documentation rather than fixing this, as it's clear that hardly
anyone cares.  (See #766105.)

We also don't and won't support the Intel Quark, although it is
basically Pentium-compatible due to serious errata with no reasonable
workaround.  Document this exception.

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