Update challenge_8.md

Author: shivaylamba

Challenges/challenge_8.md

@@ -8,4 +8,4 @@ Today's challenge is simple. But along side the task, please give the [following
 Task: 
 1. Inside the branch you created during the prior challenges in your forked repository, make a new file by the name of ``your-github-username-2.md`` and add any details you may want to add to this markwdown file and push the change
 
-2. Ensure the change appears in the Pull request. 
+2. Ensure the change appears in the Pull request created in previous challenges