Update article.md

Change "and" to "or". Goes better with "no".

Author: paroche

1-js/07-object-properties/02-property-accessors/article.md

@@ -104,7 +104,7 @@ There's no similar method to handle deletion of an accessor property. Only gette
 
 Descriptors for accessor properties are different -- as compared with data properties.
 
-For accessor properties, there is no `value` and `writable`, but instead there are `get` and `set` functions.
+For accessor properties, there is no `value` or `writable`, but instead there are `get` and `set` functions.
 
 That is, an accessor descriptor may have: