Fix `ActionController::Parameters#each_value` and add changelog entry to this method (#34210)

* Fix `ActionController::Parameters#each_value`

`each_value` should yield with "value" of the params instead of "value" as an array.
Related to #33979

* Add changelog entry about `ActionController::Parameters#each_value`.

Follow up #33979

actionpack/CHANGELOG.md

@@ -1,3 +1,7 @@
+*   Add `ActionController::Parameters#each_value`.
+
+    *Lukáš Zapletal*
+
 *   Deprecate `ActionDispatch::Http::ParameterFilter` in favor of `ActiveSupport::ParameterFilter`.
 
     *Yoshiyuki Kinjo*

actionpack/lib/action_controller/metal/strong_parameters.rb

@@ -352,7 +352,7 @@ module ActionController
     # the same way as <tt>Hash#each_value</tt>.
     def each_value(&block)
       @parameters.each_pair do |key, value|
-        yield [convert_hashes_to_parameters(key, value)]
+        yield convert_hashes_to_parameters(key, value)
       end
     end
 

actionpack/test/controller/parameters/accessors_test.rb

@@ -77,11 +77,15 @@ class ParametersAccessorsTest < ActiveSupport::TestCase
 
   test "each_value carries permitted status" do
     @params.permit!
-    @params["person"].each_value { |value| assert(value.permitted?) if value == 32 }
+    @params.each_value do |value|
+      assert_predicate(value, :permitted?)
+    end
   end
 
   test "each_value carries unpermitted status" do
-    @params["person"].each_value { |value| assert_not(value.permitted?) if value == 32 }
+    @params.each_value do |value|
+      assert_not_predicate(value, :permitted?)
+    end
   end
 
   test "each_key converts to hash for permitted" do