Merge pull request #1814 from michael-mcgee/closure-article-edit

Edit sentance syntax in closure article

1-js/06-advanced-functions/03-closure/article.md

@@ -182,7 +182,7 @@ Here's a little bit longer code:
 Rectangles on the right-hand side demonstrate how the global Lexical Environment changes during the execution:
 
 1. When the script starts, the Lexical Environment is pre-populated with all declared variables.
-    - Initially, they are in the "Uninitialized" state. That's a special internal state, it means that the engine knows about the variable, but won't allow to use it before `let`. It's almost the same as if the variable didn't exist.
+    - Initially, they are in the "Uninitialized" state. That's a special internal state, it means that the engine knows about the variable, but it cannot be referenced until it has been declared with `let`. It's almost the same as if the variable didn't exist.
 2. Then `let phrase` definition appears. There's no assignment yet, so its value is `undefined`. We can use the variable since this moment.
 3. `phrase` is assigned a value.
 4. `phrase` changes the value.