Merge pull request w3c#5415 from zjopy/master

Editorial fix, no need for IPR commitment.

Author: tabatkins

css-flexbox-1/Overview.bs

@@ -307,7 +307,7 @@ Overview</h3>
 		Here's an example of a catalog where each item has a title, a photo, a description, and a purchase button.
 		The designer's intention is that each entry has the same overall size,
 		that the photo be above the text,
-		and that the purchase buttons aligned at the bottom, regardless of the length of the item's description.
+		and that the purchase buttons are aligned at the bottom, regardless of the length of the item's description.
 		Flex layout makes many aspects of this design easy:
 
 		* The catalog uses flex layout to lay out rows of items horizontally,

css-grid-1/Overview.bs

@@ -3264,7 +3264,7 @@ Grid Item Placement Algorithm</h3>
 			</pre>
 
 			The number of columns needed is 6.
-			The <a>explicit grid</a> provides its 5 columns
+			The <a>explicit grid</a> provides 5 columns
 			(from 'grid-template-columns')
 			with lines number 1 through 6,
 			but <code>#grid-item</code>’s column position means it ends on line 7,