Eliminates indexing for %?LANG

Which is not actually implemented, and also for &?ROUTINE, which is
indexed again further down. Closes #2523

Author: JJ

doc/Language/variables.pod6

@@ -1114,7 +1114,7 @@ C<$!> is set to the C<Any> type object.
 Note that C<CATCH> blocks I<do not> set C<$!>. Rather they set C<$_> inside
 the block to the caught exception.
 
-X<|$?FILE>X<|$?LINE>X<|::?CLASS>X<|&?ROUTINE>X<|&?BLOCK>X<|%?LANG>X<|%?RESOURCES>
+X<|$?FILE>X<|$?LINE>X<|::?CLASS>X<|&?BLOCK>X<|%?RESOURCES>
 =head2 Compile-time variables
 
 All compile time variables have a question mark as part of the twigil.
@@ -1127,7 +1127,6 @@ The most common compile time variables are the following:
     $?FILE         Which file am I in?
     $?LINE         Which line am I at? [indexed from 1]
     ::?CLASS       Which class am I in?
-    %?LANG         What is the current set of interwoven languages?
     %?RESOURCES    The files associated with the "Distribution" of the current compilation unit.
 
 C<$?FILE> and C<$?LINE> are also available from L<CallFrame|/type/CallFrame> as
@@ -1490,4 +1489,4 @@ words, such like C<add_method>.
 
 =end pod
 
-# vim: expandtab softtabstop=4 shiftwidth=4 ft=perl6
+# vim: expandtab softtabstop=4 shiftwidth=4 ft=perl6