Update react/README.md

Fix jsx syntax display issue in webpage

Fixes airbnb#2301

react/README.md

@@ -242,7 +242,8 @@ This style guide is mostly based on the standards that are currently prevalent i
   - Always use double quotes (`"`) for JSX attributes, but single quotes (`'`) for all other JS. eslint: [`jsx-quotes`](https://eslint.org/docs/rules/jsx-quotes)
 
     > Why? Regular HTML attributes also typically use double quotes instead of single, so JSX attributes mirror this convention.
-
+    
+    <!--- {% raw %} -->
     ```jsx
     // bad
     <Foo bar='bar' />
@@ -256,7 +257,8 @@ This style guide is mostly based on the standards that are currently prevalent i
     // good
     <Foo style={{ left: '20px' }} />
     ```
-
+    <!--- {% endraw %} -->
+
 ## Spacing
 
   - Always include a single space in your self-closing tag. eslint: [`no-multi-spaces`](https://eslint.org/docs/rules/no-multi-spaces), [`react/jsx-tag-spacing`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-tag-spacing.md)