docs: fix typos (#4706)

Author: tbroadley

beta/src/pages/apis/useref.md

@@ -206,7 +206,7 @@ When you break these rules, your component might still work, but most of the new
 
 ### Manipulating the DOM with a ref {/*manipulating-the-dom-with-a-ref*/}
 
-It's particularly common to use a ref to manipulate the [DOM](https://developer.mozilla.org/en-US/docs/Web/API/HTML_DOM_API). React has bulit-in support for this.
+It's particularly common to use a ref to manipulate the [DOM](https://developer.mozilla.org/en-US/docs/Web/API/HTML_DOM_API). React has built-in support for this.
 
 First, declare a <CodeStep step={1}>ref object</CodeStep> with an <CodeStep step={3}>initial value</CodeStep> of `null`:
 

beta/src/pages/learn/your-first-component.md

@@ -398,7 +398,7 @@ img { margin: 0 10px 10px 0; }
 
 ### Your own component {/*your-own-component*/}
 
-Write a component from scratch. You can give it any valid name and return any markup. If you're out of ideas, you can write a `Congratulations` component thats shows `<h1>Good job!</h1>`. Don't forget to export it!
+Write a component from scratch. You can give it any valid name and return any markup. If you're out of ideas, you can write a `Congratulations` component that shows `<h1>Good job!</h1>`. Don't forget to export it!
 
 <Sandpack>