Capitalize Components in docs

src/content/learn/index.md

@@ -23,7 +23,7 @@ Welcome to the React documentation! This page will give you an introduction to 8
 
 React apps are made out of *components*. A component is a piece of the UI (user interface) that has its own logic and appearance. A component can be as small as a button, or as large as an entire page.
 
-React components are JavaScript functions that return markup:
+React Components are JavaScript functions that return markup:
 
 ```js
 function MyButton() {

src/content/learn/your-first-component.md

@@ -88,7 +88,7 @@ With `function Profile() { }` you define a JavaScript function with the name `Pr
 
 <Pitfall>
 
-React components are regular JavaScript functions, but **their names must start with a capital letter** or they won't work!
+React Components are regular JavaScript functions, but **their names must start with a capital letter** or they won't work!
 
 </Pitfall>
 
@@ -227,7 +227,7 @@ You've just gotten your first taste of React! Let's recap some key points.
 
 * React lets you create components, **reusable UI elements for your app.**
 * In a React app, every piece of UI is a component.
-* React components are regular JavaScript functions except:
+* React Components are regular JavaScript functions except:
 
   1. Their names always begin with a capital letter.
   2. They return JSX markup.

src/content/reference/react/Component.md

@@ -10,7 +10,7 @@ We recommend defining components as functions instead of classes. [See how to mi
 
 <Intro>
 
-`Component` is the base class for the React components defined as [JavaScript classes.](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes) Class components are still supported by React, but we don't recommend using them in new code.
+`Component` is the base class for the React components defined as [JavaScript classes.](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes) Class Components are still supported by React, but we don't recommend using them in new code.
 
 ```js
 class Greeting extends Component {

src/content/reference/react/PureComponent.md

@@ -10,7 +10,7 @@ We recommend defining components as functions instead of classes. [See how to mi
 
 <Intro>
 
-`PureComponent` is similar to [`Component`](/reference/react/Component) but it skips re-renders for same props and state. Class components are still supported by React, but we don't recommend using them in new code.
+`PureComponent` is similar to [`Component`](/reference/react/Component) but it skips re-renders for same props and state. Class Components are still supported by React, but we don't recommend using them in new code.
 
 ```js
 class Greeting extends PureComponent {