Update associations.rb API documentation [ci skip] (#33857)
Update associations.rb API documentation [ci skip] (#33857)

* Update association_basics.md [ci skip]

Addresses issue #33599

* Update associations.rb API documentation [ci skip]

Additional detail for documentation of `belongs_to` `association=(associate)`

* Update association_basics.md [ci skip]

Reverts misplaced documentation comment

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