fixup! edit error message

Author: himself65

test/parallel/test-process-env-ignore-getter-setter.js

@@ -12,7 +12,7 @@ assert.throws(
     code: 'ERR_INVALID_OBJECT_DEFINE_PROPERTY',
     name: 'TypeError',
     message: '\'process.env\' only accepts a ' +
-        'configurable, writable' +
+        'configurable, writable,' +
         ' and enumerable data descriptor'
   }
 );
@@ -51,7 +51,7 @@ attributes.forEach((attribute) => {
       code: 'ERR_INVALID_OBJECT_DEFINE_PROPERTY',
       name: 'TypeError',
       message: '\'process.env\' only accepts a ' +
-          'configurable, writable' +
+          'configurable, writable,' +
           ' and enumerable data descriptor'
     }
   );