Fix link

part of #4476

Author: coke

doc/Type/Hash.rakudoc

@@ -400,7 +400,7 @@ is:
 Returns the default value of the invocant, i.e. the value which is returned when
 a non existing key is used to access an element in the C<Hash>. Unless the
 C<Hash> is declared as having a default value by using the
-L<is default|/syntax/is default (Attribute)> trait the method returns the type object
+L<is default|/type/Variable#trait_is_default> trait the method returns the type object
 C<(Any)>.
 
     my %h1 = 'apples' => 3, 'oranges' => 7;