FIX: only admin can edit faq, tos, and privacy policy

lib/guardian/post_guardian.rb

@@ -72,6 +72,10 @@ module PostGuardian
 
   # Editing Method
   def can_edit_post?(post)
+    if Discourse.static_doc_topic_ids.include?(post.topic_id) && !is_admin?
+      return false
+    end
+
     if is_staff? || @user.has_trust_level?(:elder)
       return true
     end

lib/guardian/topic_guardian.rb

@@ -27,7 +27,10 @@ module TopicGuardian
 
   # Editing Method
   def can_edit_topic?(topic)
-    !topic.archived && (is_staff? || is_my_own?(topic) || user.has_trust_level?(:leader))
+    return false if topic.archived
+    return true if is_my_own?(topic)
+    return false if Discourse.static_doc_topic_ids.include?(topic.id) && !is_admin?
+    is_staff? || user.has_trust_level?(:leader)
   end
 
   # Recovery Method