Kerberos (https://rubygems.org/gems/mongo_kerberos):

• add source code
• add mailing list
• add bug tracker

Bson (https://rubygems.org/gems/bson):

• add source code
• update documentation to point to https://docs.mongodb.com/ruby-driver/master/bson-tutorials/ rather than API docs
• add mailing list
• add bug tracker

Driver (https://rubygems.org/gems/mongo):

• Update documentation to point to https://docs.mongodb.com/ruby-driver/master/ rather than API docs
• Remove wiki since it just points to driver homepage

Mongoid (https://rubygems.org/gems/mongoid):

• Update homepage since it points to mongoid.org which doesn't load at all
• Update documentation to point to https://docs.mongodb.com/mongoid/master/ and not the non-functioning homepage
• Remove wiki

Metadata reference: https://guides.rubygems.org/specification-reference/#metadata