Actually put ExtORPortCookieAuthFile into config.c

Fixes bug 11635; bugfix on 0.2.5.1-alpha.
Fix some option names in the manpage.

Found with 'make check-docs'.  Part of 11634.
Remove a spurious anchor in the manpage. part of 11634.
Remove documentation for obsolete FetchV2Networkstatus
Fix capitalization of MaxMemInQueues

This won't affect anybody's configuration, but it makes it match what
we documented. Fixes part of 11634.
Provide missing documentation for two options. For 11634.
changes file for 11634 documentation fixes