The following three lines are out of date and need changes:
Desired log output format is set to mongod, mongos and the mongo shell using the `-logFormat` option. Available values are `text` and `json`. Currently text formatting is default. Produces legacy log statements matching the old log system. This format may or may not be removed for the 4.4 server release. The BSON formatter is an internal formatter that may or may not be removed.