[css-ui-4] Combine sentences about UA-controlled caret animations

This change is editorial.

Author: frivoal

css-ui-4/Overview.bs

@@ -1155,8 +1155,9 @@ Animation of the insertion caret: 'caret-animation'
 	
 		auto
 		
-			The UA determines how the caret should be animated, if at all.
-			It should match platform conventions,
+			The UA determines how the caret should be animated, if at all,
+			as well as the speed of any such animation.
+			It should match platform conventions and settings,
 			and may be adjusted based on context.
 
 			Note: This is typically rendered as a blinking caret.
@@ -1171,9 +1172,6 @@ Animation of the insertion caret: 'caret-animation'
 			they apply normally.
 	
 
-	The UA determines the speed at which the cursor animates (blinks, fades…).
-	It should follow platform conventions and settings.
-
 	Note: It is recommended for authors to stop the caret from blinking or fading
 	using ''caret-animation: manual''
 	when applying custom animations using [[CSS3-ANIMATIONS]],