Update CONTRIBUTING.md

Author: lorepieri8

CONTRIBUTING.md

@@ -4,9 +4,7 @@ Your contributions are welcome!
 
 ## Guidelines
 
-* Add section if needed.
-    * Add section description.
-    * Add section title to Table of contents.
+* Add a section if needed and add the section title to the Table of contents.
 * Follow the notations and conventions already adopted.
 * Check your spelling and grammar.
 * Send a Pull Request.