doc: Add new 'Circular Module Dependencies' section.

* doc/contributing.texi (Circular Module Dependencies): New subsection.

Series-version: 2
Series-to: 65860@debbugs.gnu.org
Patch-cc: mhw@netris.org
Cover-letter:
Resolve a circular module dependencies in embedded modules
This series is the culmination of at least a day of effort tracking down the
source of a module dependency cycle (!).  The last commit adds some guidelines
in the hope to avoid a repeat (perhaps 'lint' could be taught to
automate these checks).
END

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