01-cascade-fix: Fix typo in README

This is not the 'final' exercise for CSS Foundations, as README suggests.
Because '01-margin-and-padding-1' and '02-margin-and-padding-2' are the
last exercises for CSS Foundations, this README's wording needs to be
updated for accuracy.

Author: dahans1

foundations/cascade/01-cascade-fix/README.md

@@ -1,6 +1,6 @@
 # CSS Methods
 
-This final exercise for CSS Foundations is going to give you a closer look at the cascade, in particular specificity and rule order. Both the HTML and CSS files are filled out for you, so instead of adding rules yourself, you will simply be editing what is provided.
+This next exercise for CSS Foundations is going to give you a closer look at the cascade, in particular specificity and rule order. Both the HTML and CSS files are filled out for you, so instead of adding rules yourself, you will simply be editing what is provided.
 
 There are a few elements that have some sort of specificity or rule order issue in the provided CSS file. It's up to you to figure out what issue is affecting an element, and how to fix it. You can edit the CSS file by adding, removing, or editing selectors for a declaration block, or by moving declaration blocks around. **You should not edit the HTML file or any of the actual styles in the CSS**.