prevent tab-triggers for snippets when in phpdoc scope

Currently tab-triggers for snippets are active in phpdoc, too, with the affect that snippets are inserted in documentation blocks, where you normally don't want to have them, for example:

    class test {
        /**
         * ...
         * @param array[tab-trigger]
         */
        function test($arg) {
        }
    }

expands to:

    class test {
        /**
         * ...
         * @param $arrayName = array('' => , );
         */
        function test($arg) {
        }
    }

My commit changes scope to "source.php - comment.block.documentation.phpdoc.php".

I was not sure, if i should really add it to all snippets or just for things like "array". I decided to apply the change to almost all relevant snippets, to stay consistent.