add comma

Author: gfldex

doc/Language/typesystem.pod6

@@ -49,8 +49,8 @@ Values can become undefined at runtime via L<mixin|/language/operators#infix_but
     # OUTPUT«undefined␤»
 
 To test for definedness call C<.defined>, use
-L<//|/language/operators#infix_//>
-L<with/without|/language/control#with,_orwith,_without> and
+L<//|/language/operators#infix_//>,
+ L<with/without|/language/control#with,_orwith,_without> and
 L<signatures|/type/Signature#Constraining_Defined_and_Undefined_Values>
 
 =head1 Type Declarators