Fix phpdoc comments for HttpCommandExecutor.
Fix phpdoc comments for HttpCommandExecutor.

cedricalfonsi/php-webdriver,passbolt/passbolt_selenium,OndraM/php-webdriver,OndraM/php-webdriver,cedricalfonsi/php-webdriver,OndraM/php-webdriver,OndraM/php-webdriver,passbolt/passbolt_selenium