fix broken links

Author: gfldex

doc/Language/operators.pod6

@@ -1916,7 +1916,7 @@ statement in a routine or type, it marks that routine or type as a stub
 (which is significant in the context of pre-declaring types and composing
 roles).
 
-If the C<...> statement is executed, it calls L<&fail>, with the default
+If the C<...> statement is executed, it calls L<fail|/routine/fail>, with the default
 message C<stub code executed>.
 
 =head2 listop C«!!!»
@@ -1928,7 +1928,7 @@ statement in a routine or type, it marks that routine or type as a stub
 (which is significant in the context of pre-declaring types and composing
 roles).
 
-If the C<!!!> statement is executed, it calls L<&die>, with the default
+If the C<!!!> statement is executed, it calls L<die|/routine/die>, with the default
 message C<stub code executed>.
 
 =head2 listop C«???»
@@ -1940,7 +1940,7 @@ statement in a routine or type, it marks that routine or type as a stub
 (which is significant in the context of pre-declaring types and composing
 roles).
 
-If the C<???> statement is executed, it calls L<&warn>, with the default
+If the C<???> statement is executed, it calls L<warn|/routine/warn>, with the default
 message C<stub code executed>.
 
 =head2 Reduction operators