Update README.md

Author: codyloyd

flex/04-flex-information/README.md

@@ -10,10 +10,10 @@ For this one you will need to edit the HTML a little bit too. We can't be making
 
 ### Self Check
 
-- All items are centered on the page
+- All items are centered on the page (horizontally, not vertically)
 - Title is centered on the page
 - 32px between the title and the 'items'
 - 52px between each item
 - Items are arranged horizontally on the page
 - Items are only 200px wide and the text wraps
-- Item text is centered
+- Item text is centered