Correct link to S05/Substitution

Noticed by Zoffix++ in IRC

Author: paultcochrane

lib/Language/5to6.pod

@@ -802,7 +802,8 @@ In Perl 6, the C<~~> smartmatch op is used instead.
     $line ~~ s/abc/123/;          # Perl 6
 
 Alternately, the new C<.match> and C<.subst> methods can be used. Note that
-C<.subst> is non-mutating. See L<S05/Substitution>
+C<.subst> is non-mutating. See
+L<S05/Substitution|http://design.perl6.org/S05.html#Substitution>.
 
 =head3 Move modifiers