Update README.mdx (#111)

Remove the dad joke line as the next section is about Resource routes.

Author: anukmathew

exercises/02.routing/03.solution.params/README.mdx

@@ -4,5 +4,3 @@
 
 👨‍💼 Great work 👏👏👏 We've got routes setup and we're using the route params to
 get the username of the user we want to show. You've done a great job so far.
-Next, we're going to want to actually load user data, but you should take a
-break first... Thanks for the good work 🎉