Add role="historic" attributes to all release notes that were MFC-ed

as of 4.6-RELEASE (or earlier).  This commit shouldn't have any immediate
effect, but we'll eventually use some stylesheet magic to remove
the historic release notes from the output stream.  This will have
the effect of making the 5.0-RELEASE release notes contain material
only relevent to -CURRENT *or* recently MFC-ed to 4-STABLE.

The stylesheet fixes will follow later, once I work out a couple more
details.  I wanted to get this commit done now, before anything gets
MFC-ed in the post-4.6 world (so we don't need to go back later and
figure this out).

If a historic release note gets modified, it may very well be
appropriate to remove its historic attribute.

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