Fix rubocop issue

.rubocop_todo.yml

@@ -498,11 +498,6 @@ Style/ClassVars:
   Exclude:
     - 'lib/open_food_network/rack_request_blocker.rb'
 
-# Offense count: 1
-Style/CommentedKeyword:
-  Exclude:
-    - 'app/controllers/application_controller.rb'
-
 # Offense count: 1
 # Cop supports --auto-correct.
 # Configuration parameters: EnforcedStyle, SingleLineConditionsOnly, IncludeTernaryExpressions.

app/controllers/application_controller.rb

@@ -134,7 +134,8 @@ class ApplicationController < ActionController::Base
     nil
   end
 
-  def set_cache_headers # https://jacopretorius.net/2014/01/force-page-to-reload-on-browser-back-in-rails.html
+  # See https://jacopretorius.net/2014/01/force-page-to-reload-on-browser-back-in-rails.html
+  def set_cache_headers
     response.headers["Cache-Control"] = "no-cache, no-store, max-age=0, must-revalidate"
     response.headers["Pragma"] = "no-cache"
     response.headers["Expires"] = "Fri, 01 Jan 1990 00:00:00 GMT"