Update Postgres guide for ActiveRecord::Enum support
Update Postgres guide for ActiveRecord::Enum support

Updates https://guides.rubyonrails.org/active_record_postgresql.html#enumerated-types based the new features added in https://github.com/rails/rails/pull/41469

kddeisz/rails,BlakeWilliams/rails,rails/rails,MSP-Greg/rails,BlakeWilliams/rails,BlakeWilliams/rails,yahonda/rails,rails/rails,Erol/rails,georgeclaghorn/rails,MSP-Greg/rails,Erol/rails,yahonda/rails,kddeisz/rails,Edouard-chin/rails,esparta/rails,Erol/rails,Erol/rails,kmcphillips/rails,kddeisz/rails,yawboakye/rails,Edouard-chin/rails,kmcphillips/rails,yahonda/rails,Edouard-chin/rails,kmcphillips/rails,georgeclaghorn/rails,Edouard-chin/rails,yawboakye/rails,MSP-Greg/rails,BlakeWilliams/rails,MSP-Greg/rails,yawboakye/rails,rails/rails,rails/rails,yawboakye/rails,kddeisz/rails,esparta/rails,esparta/rails,esparta/rails,kmcphillips/rails,georgeclaghorn/rails,georgeclaghorn/rails,yahonda/rails