Remove unnecessary comments

db/migrate/20210719182944_add_request_response_to_supporing_message.rb

 # frozen_string_literal: true
 
-# See https://docs.gitlab.com/ee/development/migration_style_guide.html
-# for more information on how to write migrations for GitLab.
-
 class AddRequestResponseToSupporingMessage < ActiveRecord::Migration[6.1]
   def change
     change_column_null(:vulnerability_finding_evidence_requests, :vulnerability_finding_evidence_id, true)

ee/app/models/vulnerabilities/finding/evidence/request.rb

@@ -11,11 +11,13 @@ module Vulnerabilities
         belongs_to :evidence,
                    class_name: 'Vulnerabilities::Finding::Evidence',
                    inverse_of: :request,
-                   foreign_key: 'vulnerability_finding_evidence_id'
+                   foreign_key: 'vulnerability_finding_evidence_id',
+                   optional: true
         belongs_to :supporting_message,
                    class_name: 'Vulnerabilities::Finding::Evidence::SupportingMessage',
                    inverse_of: :request,
-                   foreign_key: 'vulnerability_finding_evidence_supporting_message_id'
+                   foreign_key: 'vulnerability_finding_evidence_supporting_message_id',
+                   optional: true
 
         has_many :headers,
                  class_name: 'Vulnerabilities::Finding::Evidence::Header',

ee/app/models/vulnerabilities/finding/evidence/response.rb

@@ -11,11 +11,13 @@ module Vulnerabilities
         belongs_to :evidence,
                    class_name: 'Vulnerabilities::Finding::Evidence',
                    inverse_of: :response,
-                   foreign_key: 'vulnerability_finding_evidence_id'
+                   foreign_key: 'vulnerability_finding_evidence_id',
+                   optional: true
         belongs_to :supporting_message,
                    class_name: 'Vulnerabilities::Finding::Evidence::SupportingMessage',
                    inverse_of: :response,
-                   foreign_key: 'vulnerability_finding_evidence_supporting_message_id'
+                   foreign_key: 'vulnerability_finding_evidence_supporting_message_id',
+                   optional: true
 
         has_many :headers,
                  class_name: 'Vulnerabilities::Finding::Evidence::Header',