Add missing curly brace. Typo fix for a module import.

pages/Iterators and Generators.md

@@ -32,6 +32,7 @@ for (let i in list) {
 
 for (let i of list) {
    console.log(i); // "4", "5", "6"
+}
 ```
 
 Another distinction is that `for..in` operates on any object; it serves as a way to inspect properties on this object.

pages/Modules.md

@@ -166,7 +166,7 @@ export default class ZipCodeValidator {
 ```ts
 import validator from "./ZipCodeValidator";
 
-let validator = new validator();
+let myValidator = new validator();
 ```
 
 or
@@ -244,7 +244,7 @@ import zip = require("./ZipCodeValidator");
 let strings = ["Hello", "98052", "101"];
 
 // Validators to use
-let validator = new zip.ZipCodeValidator();
+let validator = new zip();
 
 // Show whether each string passed each validator
 strings.forEach(s => {

pages/Symbols.md

@@ -24,9 +24,10 @@ Just like strings, symbols can be used as keys for object properties.
 ```ts
 let sym = Symbol();
 
-let obj = {};
+let obj = {
+    [sym]: "value"
+};
 
-obj[sym] = "value";
 console.log(obj[sym]); // "value"
 ```