[mediaqueries] Remove hover:on-demand

Author: frivoal

mediaqueries/Overview.bs

@@ -1647,7 +1647,7 @@ hover</h3>
 
 	<pre class='descdef mq'>
 	Name: hover
-	Value: none | on-demand | hover
+	Value: none | hover
 	For: @media
 	Type: discrete
 	</pre>
@@ -1666,12 +1666,11 @@ hover</h3>
 			or there is no pointing system.
 			Examples include touchscreens and screens that use a drawing stylus.
 
-		<dt><dfn>on-demand</dfn>
-		<dd>
-			Indicates that the primary pointing system can hover,
-			but it requires a significant action on the user's part.
-			For example, some devices can't normally hover,
-			but will activate hover on a “long press”.
+			Pointing systems that can hover,
+			but for which doing so is inconvenient and not part of the normal way they are used,
+			also match this value.
+			For example, a touchscreen where a long press is treated as hovering
+			would match ''hover: none''.
 
 		<dt><dfn>hover</dfn>
 		<dd>
@@ -1717,7 +1716,7 @@ any-pointer and any-hover</h3>
 
 	<pre class='descdef mq'>
 	Name: any-hover
-	Value: none | on-demand | hover
+	Value: none | hover
 	For: @media
 	Type: discrete
 	</pre>