Change intro in readme.md

Remove the wording "It is easy" or "This is easy" from the description. This may be somewhat demotivating to someone who may be having a difficult time with these concepts.

Author: mmackz

grid/02-grid-layout-2/README.md

@@ -1,6 +1,6 @@
 # Responsive Holy Grail Layout with Grid
 
-This one is easy! We are going to take our Holy Grail Layout from the first exercise and make it responsive. To do this we will simply change our fixed track sizes to be dynamic. Consider this a warmup for the next exercise and make sure your layout is responding properly when resizing the browser window.
+For this exercise, we are going to take our Holy Grail Layout from the first exercise and make it responsive. To do this we will simply change our fixed track sizes to be dynamic. Consider this a warmup for the next exercise and make sure your layout is responding properly when resizing the browser window.
 
 ### Hints
 - You only need to add to the CSS selectors