Rewrite to account for the additional display mode.

This now accounts for the fact that there are now more than two
non-application-context display modes.

mediaqueries-5/Overview.bs

@@ -1330,18 +1330,20 @@ Display Modes: the ''display-mode'' media feature </h3>
 
 		<dt><dfn>standalone</dfn>
 		<dd>
-			The [=display mode/standalone=] display mode is in use.
+			The [=display mode/standalone=] display mode is in use. Only applicable in an [=application
+			context=].
 
 		<dt><dfn>minimal-ui</dfn>
 		<dd>
-			The [=display mode/minimal-ui=] display mode is in use.
+			The [=display mode/minimal-ui=] display mode is in use. Only applicable in an [=application
+			context=].
 
 		<dt><dfn>browser</dfn>
 		<dd>
 			The browsing context is displayed using the platform-specific convention for opening
 			hyperlinks in the user agent (e.g., in a browser tab or web browser window with controls such
 			as an address bar). This should be used for non-[=application context|application contexts=]
-			that are not fullscreen.
+			where no other display mode is appropriate.
 
 			Corresponds to the [=display mode/browser=] display mode.
 
@@ -1371,8 +1373,7 @@ Display Modes: the ''display-mode'' media feature </h3>
 		<pre class="lang-css">@media (display-mode: standalone) { … }</pre>
 
 		The user agent could set '@media/display-mode' to any of the other values, depending on the
-		actual mode currently in use. When used outside of an [=application context=], the
-		'@media/display-mode' will always be ''display-mode/browser'' or ''display-mode/fullscreen''.
+		actual mode currently in use.
 	</div>
 
 	<details class="note">