Minor fixes and improvements in obby/rudel-obby-client.el
* obby/rudel-obby-client.el
  (rudel-obby-client-state-idle::rudel-obby/net6_client_join): use
  test = when locating user; improved comment
  (rudel-obby-client-state-idle::rudel-obby/obby_document_create):
  added TODO item regarding not displaying messages from the backend
  (rudel-obby-client-state-idle::rudel-obby/obby_document/rename):
  improved documentation string
  (rudel-obby-client-state-session-synching): reflowed documentation
  strings of slots
  (rudel-obby-client-state-subscribing::rudel-obby/obby_document/sync_init):
  fixed name of document slot