Merge pull request w3c#5360 from zjopy/master

editorial, so no IPR commitment necessary

Author: tabatkins

css-backgrounds-3/Overview.bs

@@ -1008,7 +1008,7 @@ body {
 <p>The following example rounds the height of the image to 33.3%, up
 from the specified value of 30%. At 30%, three images would fit
 entirely and a fourth only partially. After rounding, three images
-fit. The width of the image is 20% of the background area width and is
+fit. The width of the image is 20% of the background positioning area width and is
 not rounded.
 
 <pre>

css-values-4/Overview.bs

@@ -1016,7 +1016,7 @@ Compatible Units</h4>
 	all value types (percentages, numbers, keywords, etc.)
 	that represent lengths are considered <a>compatible</a> with lengths.
 	Likewise any future API that returns <a>used values</a>
-	must consider any values represent distances/durations/frequencies/etc.
+	must consider any values that represent distances/durations/frequencies/etc.
 	as <a>compatible</a> with the relevant class of <a>dimensions</a>,
 	and canonicalize accordingly.