Update 5to6-perlop.pod6

fix link in smart match in binding section

doc/Language/5to6-perlop.pod6

@@ -97,7 +97,7 @@ C<=~> and C<!~> have been replaced by C<~~> and C<!~~>, respectively.
 Those of you who consider smartmatching broken in Perl 5 will be happy
 to hear that it works much better in Perl 6, as the stronger typing
 means less guesswork. See
-L<the smartmatch documentation|language/operators#index-entry-smartmatch_operator> for a
+L<the smartmatch documentation|/language/operators#index-entry-smartmatch_operator> for a
 more extensive explanation of how smartmatch works in Perl 6.
 
 =head2 Multiplicative operators