[css-values-4] Change range example to use angle, since all angle units are canonically equivalent. w3c#7584

Author: tabatkins

css-values-3/Overview.bs

@@ -727,7 +727,9 @@ Range Restrictions and Range Definition Notation</h3>
 	within the angle brackets, after the identifying keyword,
 	indicating a closed range
 	between (and including) <var>min</var> and <var>max</var>.
-	For example, <<integer [0,10]>> indicates an integer between ''0'' and ''10'', inclusive.
+	For example, <<integer [0,10]>> indicates an integer between ''0'' and ''10'', inclusive,
+	while <<angle [0, 180deg]>> indicates an angle between ''0deg'' and ''180deg''
+	(expressed in any unit).
 
 	Note: CSS values generally do not allow open ranges;
 	thus only square-bracket notation is used.

css-values-4/Overview.bs

@@ -1097,7 +1097,7 @@ Range Restrictions and Range Definition Notation</h3>
 	indicating a closed range
 	between (and including) <var>min</var> and <var>max</var>.
 	For example, <<integer [0,10]>> indicates an integer between ''0'' and ''10'', inclusive,
-	while <<length [0, 100px]>> indicates a length between ''0px'' and ''100px''
+	while <<angle [0, 180deg]>> indicates an angle between ''0deg'' and ''180deg''
 	(expressed in any unit).
 
 	Note: CSS values generally do not allow open ranges;