Remove unused methods

app/models/vulnerability.rb

@@ -12,17 +12,9 @@ class Vulnerability < ApplicationRecord
     '[vulnerability:'
   end
 
-  def self.reference_prefix_escaped
-    '[vulnerability&lbrack;'
-  end
-
   def self.reference_postfix
     ']'
   end
-
-  def self.reference_postfix_escaped
-    '&rbrack;'
-  end
 end
 
 Vulnerability.prepend_ee_mod