Typo fix

[skip ci] Fixing the typo which is formed a not required link.  Check here http://api.rubyonrails.org/classes/ActionController/Base.html  under paramters section
keeping it under tt tag
change function def self.table_name to self.table_name

change def self.primary_key to self.primary_key

change def self.primary_key to self.primary_key
Merge pull request #11593 from rajcybage/fix_test_models

change function def self.table_name to self.table_name
Merge pull request #11591 from ankit8898/typo

Typo fix [ci skip]
:scissors: [ci skip]