Merge pull request rails#52195 from jaynetics/fix-ar-dirty-doc

Fix ActiveRecord dirty docs

activerecord/lib/active_record/attribute_methods/dirty.rb

@@ -31,7 +31,7 @@ module AttributeMethods
     #   person.name_in_database        # => "Alice"
     #   person.saved_change_to_name?   # => true
     #   person.saved_change_to_name    # => ["Allison", "Alice"]
-    #   person.name_before_last_change # => "Allison"
+    #   person.name_before_last_save   # => "Allison"
     #
     # Similar to ActiveModel::Dirty, methods can be invoked as
     # +saved_change_to_name?+ or by passing an argument to the generic method