correcting error in openssl-pkey-get-public doc page
in openssl_verify and openssl_sign
* adding self-contained examples
* documenting that the 4th param to can be an int or a string
* improving documentation of params




git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@332644 c90b9560-bf6c-de11-be94-00142212c4b1