external ref fixes

Author: hoch

index.bs

@@ -11745,7 +11745,7 @@ Once per second, execute the update audio stats algorithm:
         [=Document/visibility state=] is `"visible"`, set <var>canUpdate</var> to
         true.
     1. Let <var>permission</var> be the [=permission state=] for the permission
-        associated with [=PermissionName/"microphone"=] access.
+        associated with [=PermissionName/microphone | "microphone"=] access.
         If <var>permission</var> is "granted", set <var>canUpdate</var> to true.
     1. If <var>canUpdate</var> is false, abort these steps.
     1. Set {{[[underrun duration]]}} to the total duration of all [=underrun events=]