03-grouping-selectors rephrase README paragraph (#505)

Author: looonnng

foundations/03-grouping-selectors/README.md

@@ -1,8 +1,6 @@
 # Grouping Selectors
 
-Let's build a little off the previous exercise, in which you (hopefully) added multiple classes to a single element in order to apply two different rules to it.
-
-Instead of having a single element with two different rules applied, though, you're instead going to give two elements each a unique class name, then add rules for styles that both elements share as well as their own unique styles. Make sure you take a good look at the outcome image below to see exactly what is unique about each element, and what both elements have in common.
+Let's build a little off the previous exercise. Here, you're going to give two elements each a unique class name, then add rules for styles that both elements share as well as their own unique styles. Make sure you take a good look at the outcome image below to see exactly what is unique about each element, and what both elements have in common.
 
 This will help you further practice adding classes and using class selectors, so be sure you add the class attribute in the HTML file. For the remainder of these exercises, the format of any colors is entirely up to you; we trust you'll practice using the different values! The properties you need to add to each element are: