Remove untrue comment from operator precedence

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@330983 c90b9560-bf6c-de11-be94-00142212c4b1
Fix typo

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@330984 c90b9560-bf6c-de11-be94-00142212c4b1
Add missing echo in example code comment

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@330985 c90b9560-bf6c-de11-be94-00142212c4b1