Merge pull request rails#46417 from spuyet/fix/activemodel-doc-error[ci-skip]

Fix active model errors add documentation

Author: p8

activemodel/lib/active_model/errors.rb

@@ -287,7 +287,7 @@ def group_by_attribute
     #   person.errors.messages
     #   # => {:name=>["can't be blank"]}
     #
-    #   person.errors.add(:name, :too_long, { count: 25 })
+    #   person.errors.add(:name, :too_long, count: 25)
     #   person.errors.messages
     #   # => ["is too long (maximum is 25 characters)"]
     #
@@ -338,7 +338,7 @@ def add(attribute, type = :invalid, **options)
     # If the error requires options, then it returns +true+ with
     # the correct options, or +false+ with incorrect or missing options.
     #
-    #   person.errors.add :name, :too_long, { count: 25 }
+    #   person.errors.add :name, :too_long, count: 25
     #   person.errors.added? :name, :too_long, count: 25                     # => true
     #   person.errors.added? :name, "is too long (maximum is 25 characters)" # => true
     #   person.errors.added? :name, :too_long, count: 24                     # => false
@@ -360,7 +360,7 @@ def added?(attribute, type = :invalid, options = {})
     # present, or +false+ otherwise. +type+ is treated the same as for +add+.
     #
     #   person.errors.add :age
-    #   person.errors.add :name, :too_long, { count: 25 }
+    #   person.errors.add :name, :too_long, count: 25
     #   person.errors.of_kind? :age                                            # => true
     #   person.errors.of_kind? :name                                           # => false
     #   person.errors.of_kind? :name, :too_long                                # => true