[Doc-SIG] Undocumented modules

[skip@mojam.com (Skip Montanaro)]

    Fred> Ok, I've pushed my logic into a somewhat-real script ...
	...
    Fred> <standard>  CGIHTTPServer
	...
    Fred>             posixpath
	...

Fred,

I think there's a logic bug.  The posixpath module is documented at

    http://www.python.org/doc/lib/module-posixpath.html

Also, some minor modules that only define manifest constants (SOCKET, ERRNO,
regex_syntax all come to mind) probably aren't worth mentioning outside the
documentation of other modules (socket, errno, regex, respectively).  ERRNO,
in particular, seems to be sucked into errno in its entirety, so probably
shouldn't be treated as a user-visible module:

    >>> id(errno.E2BIG)
    134968712
    >>> id(ERRNO.E2BIG)
    134968712

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