Encourage the user to check method docs in AR Callback/Validation Guides

Author: Earlopain

guides/source/active_record_callbacks.md

@@ -329,7 +329,7 @@ Just as with validations, it is also possible to skip callbacks by using the fol
 * [`upsert`][]
 * [`upsert_all`][]
 
-These methods should be used with caution, however, because important business rules and application logic may be kept in callbacks. Bypassing them without understanding the potential implications may lead to invalid data.
+These methods should be used with caution, however, because important business rules and application logic may be kept in callbacks. Bypassing them without understanding the potential implications may lead to invalid data. Refer to the method documentation to learn more.
 
 [`decrement!`]: https://api.rubyonrails.org/classes/ActiveRecord/Persistence.html#method-i-decrement-21
 [`decrement_counter`]: https://api.rubyonrails.org/classes/ActiveRecord/CounterCache/ClassMethods.html#method-i-decrement_counter

guides/source/active_record_validations.md

@@ -141,6 +141,7 @@ The non-bang versions don't: `save` and `update` return `false`, and
 
 The following methods skip validations, and will save the object to the
 database regardless of its validity. They should be used with caution.
+Refer to the method documentation to learn more.
 
 * [`decrement!`][]
 * [`decrement_counter`][]