Fixed typos in contributing

CONTRIBUTING.md

@@ -6,7 +6,7 @@ Please ensure your pull request adheres to the following guidelines:
 * Try to following the logical order of the items.
 * Make sure the resource is in English and well written.
 * Use the following format for resources: \[TITLE\]\(LINK\) - DESCRIPTION.
-* Use characters like &#9658 and $ to indicate videos and paid contents in resource title like **Object-Oriented Design in PHP (►$)**.
+* Use characters like `&#9658` and `$` to indicate videos and paid contents in resource title. For example: **Object-Oriented Design in PHP (►$)**.
 * Please make an individual commit for each suggestion in a pull request.
 * Keep descriptions short and simple.
 * Check your spelling and grammar.