Duplicate reference subpattern `(?|` also allows repetition of named subpatterns

This section only mentions duplicate numbered subpatterns inside the (?| … ) grouping, but it also supports named subpatterns, e.g.:

preg_match_all('/(?|(?P<x>f)oo|(?P<x>b)(ar|az))/', 'foo bar baz qux', $m);
var_dump($m);

yields:

array(4) {
  [0]=>
  array(3) {
    [0]=>
    string(3) "foo"
    [1]=>
    string(3) "bar"
    [2]=>
    string(3) "baz"
  }
  ["x"]=>
  array(3) {
    [0]=>
    string(1) "f"
    [1]=>
    string(1) "b"
    [2]=>
    string(1) "b"
  }
  [1]=>
  array(3) {
    [0]=>
    string(1) "f"
    [1]=>
    string(1) "b"
    [2]=>
    string(1) "b"
  }
  [2]=>
  array(3) {
    [0]=>
    string(0) ""
    [1]=>
    string(2) "ar"
    [2]=>
    string(2) "az"
  }
}

Open reference/pcre/pattern.syntax.xml at the linked section around line 1502 and compare its description with the supplied PHP example. Update the section to mention named subpatterns in duplicate-reference groups, including the demonstrated behavior; done when the documentation accurately covers both numbered and named subpatterns.