Update README.mdx (#126)

Author: ksb86

exercises/05.prop-getters/01.problem.collections/README.mdx

@@ -2,7 +2,7 @@
 
 🧝‍♂️ I've removed the work we did with the Slot pattern and we're also going to be
 focusing the next few exercises on the hook. So we've simplified things a little
-bit to give use a better focus on the hook.
+bit to give us a better focus on the hook.
 
 👨‍💼 In our simple example, this isn't too much for folks to remember, but in more
 complex components, the list of props that need to be applied to elements can be