remove incorrect parenthesis in filter examples

Author: snopoke

README.rst

@@ -203,9 +203,9 @@ Extensions
 |              | - ``$.objects[\\some_field,/other_field]``    |
 +--------------+-----------------------------------------------+
 | filter       | - ``$.objects[?(@some_field > 5)]``           |
-|              | - ``$.objects[?some_field = "foobar")]``      |
-|              | - ``$.objects[?some_field =~ "foobar")]``     |
-|              | - ``$.objects[?some_field > 5 & other < 2)]`` |
+|              | - ``$.objects[?some_field = "foobar"]``      |
+|              | - ``$.objects[?some_field =~ "foobar"]``     |
+|              | - ``$.objects[?some_field > 5 & other < 2]`` |
 +--------------+-----------------------------------------------+
 | arithmetic   | - ``$.foo + "_" + $.bar``                     |
 | (-+*/)       | - ``$.foo * 12``                              |