Apply suggestions from code review

Co-authored-by: Paul Adenot <paul@paul.cx>

Author: Hernqvist

index.bs

@@ -11574,17 +11574,17 @@ for the user experience, so if any of these occur it
 can be useful for the application to be able to detect them and possibly
 take some action to improve the playout.
 
-{{AudioPlayoutStats}} is a dedicated object for audio stats reporting;
+{{AudioPlayoutStats}} is a dedicated object for audio statistics reporting;
 it reports audio underrun and playout latency statistics for the
-{{AudioContext's}} playout path via
+{{AudioContext's}} playback path via
 {{AudioDestinationNode}} and the associated output device. This allows
 applications to measure underruns occurring due to underperforming
 AudioWorklets as well as underruns and latency originating in the playout
 path between the {{AudioDestinationNode}} and the output device.
 
 Underruns are defined in terms of [=underrun frames=] and [=underrun events=]:
 - An <dfn>underrun frame</dfn> is an audio frame played by the output device
-    that was not provided by the playout path.
+    that was not provided by the AudioContext.
     This happens when the playout path fails to provide audio frames
     to the output device on time, in which case underrun frames will be played
     (underrun frames are typically silence).
@@ -11688,9 +11688,9 @@ for details.
 <dl dfn-type=attribute dfn-for="AudioPlayoutStats">
     : <dfn>underrunDuration</dfn>
     ::
-        Measures the duration of [=underrun frames=] played by the
+        Returns the duration of [=underrun frames=] played by the
         {{AudioContext}}, in seconds.
-        This metric can be used together with {{totalDuration}} to
+        NOTE: This metric can be used together with {{totalDuration}} to
         calculate the percentage of played out media that was not provided by
         the {{AudioContext}}.