Fix Typo SecureToken [ci skip]

activerecord/lib/active_record/secure_token.rb

@@ -24,7 +24,7 @@ module ClassMethods
       # validates_presence_of can. You're encouraged to add a unique index in the database to deal with
       # this even more unlikely scenario.
       def has_secure_token(attribute = :token)
-        # Load securerandom only when has_secure_key is used.
+        # Load securerandom only when has_secure_token is used.
         require 'active_support/core_ext/securerandom'
         define_method("regenerate_#{attribute}") { update! attribute => self.class.generate_unique_secure_token }
         before_create { self.send("#{attribute}=", self.class.generate_unique_secure_token) }