📝 Update FlexBox docs

Author: exah

src/flex-box/about.mdx

@@ -6,9 +6,27 @@ route: /flex-box
 import { Playground } from 'docz'
 import { FlexBox } from './index'
 
-# FlexBox Component
+# FlexBox
 
-Like [`Box`](#/box) component, but extended with [flexbox](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout) specific props.
+## Description
+
+Like [`Box`](#/box) component, but extended with [flexbox](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout) specific prop styles.
+
+
+## Usage
+
+```js
+import { FlexBox } from 'pss-components'
+```
+
+```js
+<FlexBox>
+  <FlexBox.Item>Item</FlexBox.Item>
+</FlexBox>
+```
+
+
+## Examples
 
 <Playground>
   <FlexBox>