[css-grid-3] Swap auto-areas fallback to auto-fit (it just didn't exi…

…st when i first defined this) #10854

css-grid-3/Overview.bs

@@ -862,14 +862,14 @@ repeat(auto-areas)</h3>
 	the final repetition is truncated as necessary
 	to produce the correct number of tracks.
 
-	Note: Unlike ''repeat()/auto-fill''--
+	Note: Unlike ''repeat()/auto-fit''--
 	which always repeats at least once and always repeats the track listing entirely--
 	the number of repetitions for ''repeat()/auto-areas'' can be zero
 	(if there are already enough explicit tracks),
 	and the final repetition can be partial.
 
 	If 'grid-template-areas' / 'masonry-template-areas' is ''grid-template-areas/none'',
-	this value behaves as ''auto-fill''.
+	this value behaves as ''auto-fit''.
 
 	Note: This value applies both to regular [=grid containers=] and to [=masonry containers=].