Minor renames for clarity

rubocop/cop/prefer_class_methods_over_module.rb

@@ -36,7 +36,7 @@ module RuboCop
       PATTERN
       def on_module(node)
-        add_offense(node) if node.defined_module_name == 'ClassMethods' && extends_activesupport_concern?(node)
+        add_offense(node) if node.defined_module_name == 'ClassMethods' && module_extends_activesupport_concern?(node)
       end
       def autocorrect(node)
@@ -47,7 +47,7 @@ module RuboCop
       private
-      def extends_activesupport_concern?(node)
+      def module_extends_activesupport_concern?(node)
         container_module = container_module_of(node)
         return false unless container_module

spec/rubocop/cop/prefer_class_methods_over_module_spec.rb

@@ -93,6 +93,6 @@ describe RuboCop::Cop::PreferClassMethodsOverModule do
         end
       end
     RUBY
-    expect(autocorrected).to eql(expected_source)
+    expect(autocorrected).to eq(expected_source)
   end
 end