Allow admins and teachers to remove explicit RfC text

app/controllers/request_for_comments_controller.rb

@@ -1,8 +1,9 @@
 # frozen_string_literal: true
 
 class RequestForCommentsController < ApplicationController
+  include CommonBehavior
   before_action :require_user!
-  before_action :set_request_for_comment, only: %i[show mark_as_solved set_thank_you_note]
+  before_action :set_request_for_comment, only: %i[show mark_as_solved set_thank_you_note clear_question]
   before_action :set_study_group_grouping,
     only: %i[index my_comment_requests rfcs_with_my_comments rfcs_for_exercise]
 
@@ -101,6 +102,12 @@ class RequestForCommentsController < ApplicationController
     end
   end
 
+  # POST /request_for_comments/1/clear_question
+  def clear_question
+    authorize!
+    update_and_respond(object: @request_for_comment, params: {question: nil})
+  end
+
   # GET /request_for_comments/1
   # GET /request_for_comments/1.json
   def show