Nitpicks for sections 2-6 (#242)

Author: ianjmacintosh

exercises/02.side-effects/01.problem.effects/README.mdx

@@ -10,7 +10,7 @@ full refresh of the page when the user clicks the back/forward button.
 🧝‍♂️ I added a new utility called `setGlobalSearchParams` which allows us to set
 the URL search params without triggering a full-page refresh. So whenever the
 user clicks "submit," we update the URL search params. The trouble is, when they
-hit the back button, the search doesn't stay synchronoized with the URL (yet).
+hit the back button, the search doesn't stay synchronized with the URL (yet).
 
 You can take a look at <DiffLink app1={-1} app2={0}>my changes</DiffLink> for
 details on what I did.

exercises/02.side-effects/README.mdx

@@ -25,11 +25,11 @@ useEffect(() => {
 ])
 ```
 
-`useState` is for managing our react component state and `useEffect` is for
-managing side-effects. Side-effects are things that happen outside our react
+`useState` is for managing our React component state and `useEffect` is for
+managing side-effects. Side-effects are things that happen outside our React
 components.
 
-For example, things outside our react components include:
+For example, things outside our React components include:
 
 - Browser APIs like local storage, geolocation, media devices, etc.
 - Integrations with third-party libraries like D3, Chart.js, etc.

exercises/03.lifting-state/01.problem.lift/README.mdx

@@ -8,7 +8,7 @@ to know what I've done. I pretty much just moved stuff into separate components
 to get a little more organization in here.
 
 <callout-info>
-	🦉 check out [When to break up a component into multiple
+	🦉 Check out [When to break up a component into multiple
 	components](https://kentcdodds.com/blog/when-to-break-up-a-component-into-multiple-components).
 </callout-info>
 

exercises/06.tic-tac-toe/02.problem.local-storage/index.tsx

@@ -11,7 +11,7 @@ const defaultState = Array(9).fill(null)
 // 🐨 create a variable for the key you'll use for storing the squares
 // 💰 'squares' should work well.
 function Board() {
-	// 🐨 use the callback form for useState the callback should:
+	// 🐨 use the callback form for useState. The callback should:
 	// 1. get the value from localStorage using the key you created above
 	// 2. parse the JSON from that value
 	// 3. return the parsed value (or the default value if there isn't one)