Fix and Improve markdown markup in 07.spreading-props-dom.md

anti-patterns/07.spreading-props-dom.md

@@ -1,12 +1,11 @@
 # Spreading props on DOM elements
 When we spread props we run into the risk of adding unknown HTML attributes, which is a bad practice.
 
-###Reference:
-- React Design Patterns and best practices by Michele Bertoli
-
+### Reference:
+- [React Design Patterns and best practices by Michele Bertoli.](https://github.com/MicheleBertoli/react-design-patterns-and-best-practices)
 
 ##### BAD
-This will try to add the unknown HTML attribute `flag` to the DOM element
+This will try to add the unknown HTML attribute `flag` to the DOM element.
 ```javascript
 const Sample = () => (<Spread flag={true} className="content"/>);
 const Spread = (props) => (<div {...props}>Test</div>);