Fixed broken link.

Closes #1348

Author: Jan-Olof Hendig

doc/Type/CallFrame.pod6

@@ -44,7 +44,7 @@ If you just need to trace caller information, L<Backtrace> may provide a better
 
     method code(CallFrame:D:)
 
-Return the callable code for the current block. When called on the object returned by C<callframe(0)>, this will be the same value found in L<&?BLOCK>.
+Return the callable code for the current block. When called on the object returned by C<callframe(0)>, this will be the same value found in L«C<&?BLOCK>|/language/variables#Compile-time_variables».
 
 =head2 method file