docs: say who the concordance is still for

§16 opened by saying "code comments, tests and older documents cite sections
of the documents this one replaces", and closed by saying "nothing needs
editing to follow a reference". Neither holds since 20a8241: the code carries
no reference to a removed document, and that commit is precisely the editing
the second sentence said was unnecessary. Left as it was, that sentence tells
the next reader a dead reference may stay dead.

The table itself is unchanged and stays whole — every row still resolves
something. What changed is who asks: 629 commits of history that cannot be
rewritten, the superseded documents kept under docs/ (cast-smart-tv.md and
WINDOWS-PORT.md both route readers here by name), and notes held outside this
repository. The intro now says that, and states the rule the code follows
instead — cite this document and a section.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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