[react] add rule references in section *Spacing*

1pete · web-flow · commit adc782343eb8 · 2016-10-27T01:58:42.000+07:00
diff --git a/react/README.md b/react/README.md
@@ -206,7 +206,7 @@
 
 ## Spacing
 
-  - Always include a single space in your self-closing tag.
+  - Always include a single space in your self-closing tag. eslint: [`no-multi-spaces`](http://eslint.org/docs/rules/no-multi-spaces), [`react/jsx-space-before-closing`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-space-before-closing.md)
 
     ```jsx
     // bad
