Adding type option example to the documentation [ci skip] (rails#35917)

* Adding type option example to the documentation [ci skip]

It was hard for me looking https://api.rubyonrails.org/ to find that there was a type option. 

Adding this to the doc would be helpful especially for application with old tables where the references are still an integer not bigint

* Update activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb

Co-Authored-By: robertomiranda <[email protected]>

Author: robertomiranda

activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb

@@ -416,6 +416,7 @@ def timestamps(**options)
       #
       #  t.references(:user)
       #  t.belongs_to(:supplier, foreign_key: true)
+      #  t.belongs_to(:supplier, foreign_key: true, type: :integer)
       #
       # See {connection.add_reference}[rdoc-ref:SchemaStatements#add_reference] for details of the options you can use.
       def references(*args, **options)