chg POD6 to POD per discussion with AlexDaniel

to reflect rakudo changes with PR #1339

Author: tbrowder

doc/Programs/00-running.pod6

@@ -94,7 +94,7 @@ Other variables are listed in Rakudo's github wiki: L<https://github.com/rakudo/
 
 =head2 User Debugging
 
-=item C<RAKUDO_POD6_TABLE_DEBUG>
+=item C<RAKUDO_POD_TABLE_DEBUG>
 
 Enables verbose information about Perl 6 pod tables.  Useful for tweaking table pod for the
 user's intended output.