add link to /language/variables#The_*_twigil

Author: schultzdavid

doc/Type/Variable.rakudoc

@@ -71,7 +71,7 @@ sub introspect() {
 =end code
 
 The C<is dynamic> trait is a rather cumbersome way of creating and accessing
-dynamic variables.  A much easier way is to use the C<* twigil>:
+dynamic variables.  A much easier way is to use the L<C<* twigil>|/language/variables#The_*_twigil>:
 
 =begin code
 sub introspect() {