Fix for sqlite3.yml, mysql.yml

railties/lib/rails/generators/rails/app/templates/config/databases/mysql.yml

 # MySQL.  Versions 4.1 and 5.0 are recommended.
 #
-# Install the MySQL driver:
-#   gem install mysql2
+# Ensure the MySQL gem is defined in your Gemfile
+#   gem 'mysql2'
 #
 # And be sure to use new-style password hashing:
 #   http://dev.mysql.com/doc/refman/5.0/en/old-client.html

railties/lib/rails/generators/rails/app/templates/config/databases/sqlite3.yml

 # SQLite version 3.x
-#   gem install sqlite3
+#   Ensure the SQLite 3 gem is defined in your Gemfile
+#   gem 'sqlite3'
 development:
   adapter: sqlite3
   database: db/development.sqlite3