Minor changes

doc/Language/concurrency.pod6

@@ -11,7 +11,7 @@ programming, implying that an event or change in some part of a program
 may lead to an event or change in some other part of the program
 asynchronously to the program flow.
 
-The aim of the Perl concurrency design is to provide a high-level,
+The aim of the Perl 6 concurrency design is to provide a high-level,
 composable and consistent interface, regardless of how a virtual machine
 may implement it for a particular operating system, through layers of
 facilities as described below.
@@ -31,6 +31,7 @@ user code should, where possible, avoid the lower level concurrency APIs
 
 =head1 High-level APIs
 
+X<|Futures>
 =head2 Promises
 
 A L<Promise|/type/Promise> (also called I<future> in other programming