Reverse the computed value and the explanation

#268 (comment)

lib/parse.js

@@ -30,11 +30,11 @@ var interpretNumericEntities = function (str) {
 // the form is iso-8859-1, or when the submitted form has an accept-charset
 // attribute of iso-8859-1. Presumably also with other charsets that do not contain
 // the ✓ character, such as us-ascii.
-var isoSentinel = 'utf8=' + encodeURIComponent('✓'); // %26%2310003%3B
+var isoSentinel = 'utf8=%26%2310003%3B'; // encodeURIComponent('✓')
 
 // These are the percent-encoded utf-8 octets representing a checkmark, indicating
 // that the request actually is utf-8 encoded.
-var utf8Sentinel = 'utf8=' + encodeURIComponent('✓'); // %E2%9C%93
+var utf8Sentinel = 'utf8=%E2%9C%93'; // encodeURIComponent('✓')
 
 var parseValues = function parseQueryStringValues(str, options) {
     var obj = {};