Adds indexes for but and does refs #1953 (also #1303)

Author: JJ

doc/Language/objects.pod6

@@ -665,6 +665,7 @@ See document for L<clone> for details on how non-scalar attributes get cloned,
 as well as examples of implementing your own custom clone methods.
 
 =head1 X<Roles|declarator,role>
+X<|does>
 
 Roles are in some ways similar to classes, in that they are a collection of
 attributes and methods. They differ in that roles are also meant for
@@ -889,9 +890,9 @@ the role, making it possible to transparently use a role as if it were a class.
 We call this automatic creation of classes I<punning>, and the generated class
 a I<pun>.
 
+X<|Parameterized Roles>
 =head2 Parameterized Roles
 
-X<|Parameterized Roles>
 
 Roles can be parameterized, by giving them a signature in square brackets:
 
@@ -948,6 +949,7 @@ Here the signature consists only of a type capture, but any signature will do:
 You can have multiple roles of the same name, but with different signatures;
 the normal rules of multi dispatch apply for choosing multi candidates.
 
+X<|but>
 =head2 X<Mixins> of Roles
 
 Roles can be mixed into objects. A role's given attributes and methods will be