Added docs for #drop_database on MySQL adapter

activerecord/lib/active_record/connection_adapters/mysql_adapter.rb

@@ -563,6 +563,10 @@ def create_database(name, options = {})
         end
       end
 
+      # Drops a MySQL database.
+      #
+      # Example:
+      #   drop_database 'sebastian_development'
       def drop_database(name) #:nodoc:
         execute "DROP DATABASE IF EXISTS `#{name}`"
       end

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -643,7 +643,7 @@ def create_database(name, options = {})
         execute "CREATE DATABASE #{quote_table_name(name)}#{option_string}"
       end
 
-      # Drops a PostgreSQL database
+      # Drops a PostgreSQL database.
       #
       # Example:
       #   drop_database 'matt_development'