RUBY-2194 Provide forking guidance relevant to the driver (#2049)
RUBY-2194 Provide forking guidance relevant to the driver (#2049)

* RUBY-2194 Provide forking guidance relevant to the driver

* misc fixes

* link to server docs

Co-authored-by: Oleg Pudeyev <20b70f0af00562e63758b9ee42012ecc96c58590@bsdpower.com>
mongodb/mongo-ruby-driver,mongodb/mongo-ruby-driver,mongodb/mongo-ruby-driver