[selectors-4][editorial] Rephrase :muted/:volume-locked to read better. w3c#8061

Author: tabatkins

selectors-4/Overview.bs

@@ -2469,14 +2469,17 @@ Media Loading State: the '':buffering'' and '':stalled'' pseudo-classes</h3>
 Sound State: the '':muted'' and '':volume-locked'' pseudo-classes</h3>
 
 	The <dfn>:muted</dfn> pseudo-class represents
-	an element capable of making sound
-	when that element is “muted“ (forced silent).
+	an element that is capable of making sound,
+	but is currently “muted“ (forced silent).
 	(For the <{audio}> and <{video}> elements of HTML, see [=muted=]. [[HTML]])
 
 	The <dfn>:volume-locked</dfn> pseudo-class represents
-	an element capable of making sound
-	when programmatically changing the element’s volume
-	does not change the element's [=HTMLMediaElement/effective media volume=].
+	an element that is capable of making sound,
+	and currently has its volume "locked"
+	by the UA or the user,
+	so the page author cannot change it.
+	(For the <{audio}> and <{video}> elements of HTML,
+	see the algorithm for setting the element's [=HTMLMediaElement/effective media volume=]. [[HTML]])
 
 <h2 id="display-state-pseudos">
 Element Display State Pseudo-classes</h2>