Corrected grammar

Author: alaabouayed

1-js/07-object-properties/01-property-descriptors/article.md

@@ -298,14 +298,13 @@ Property descriptors work at the level of individual properties.
 There are also methods that limit access to the *whole* object:
 
 [Object.preventExtensions(obj)](mdn:js/Object/preventExtensions)
-: Forbids to add properties to the object.
+: Forbids the addition of new properties to the object.
 
 [Object.seal(obj)](mdn:js/Object/seal)
-: Forbids to add/remove properties, sets for all existing properties `configurable: false`.
+: Forbids adding/removing of properties. Sets `configurable: false` for all existing properties.
 
 [Object.freeze(obj)](mdn:js/Object/freeze)
-: Forbids to add/remove/change properties, sets for all existing properties `configurable: false, writable: false`.
-
+: Forbids adding/removing/changing of properties. Sets `configurable: false, writable: false` for all existing properties.
 And also there are tests for them:
 
 [Object.isExtensible(obj)](mdn:js/Object/isExtensible)