content(resources): fix typos

src/content/resources/javascript/promises/simplifying-promises.md

@@ -33,7 +33,7 @@ function doAsync(number) {
 ```
 
 You also don't have to nest `.then` functions, the whole point of promises
-is that they allow you do chain them sequentially.
+is that they allow you to chain them sequentially.
 
 ```js
 function doAsync(number) {

src/content/resources/javascript/variables.md

@@ -141,7 +141,7 @@ This can cause confusing behaviour, as `var` has different scoping behaviour dep
 
 ### Hoisting
 
-Variables defined using `var` are also hoisted to the top of the function they are declared in, which can casue some weird behaviour.
+Variables defined using `var` are also hoisted to the top of the function they are declared in, which can cause some weird behaviour.
 
 ```js
 console.log(myVar); // undefined.