Use [=powerful feature/name=] dfn instead of custom

This reverts commit 6617c24.

The dfn is now in the spec-data proper.

Author: anssiko

index.bs

@@ -55,9 +55,6 @@ urlPrefix: https://w3c.github.io/sensors/; spec: GENERIC-SENSOR
     text: mock sensor type
     text: MockSensorType
     text: mock sensor reading values
-urlPrefix: https://www.w3.org/TR/permissions/; spec: PERMISSIONS
-  type: dfn
-    text: name; url: dfn-name
 </pre>
 
 Introduction {#intro}
@@ -208,7 +205,7 @@ The <a>Ambient Light Sensor</a> has a <a>default sensor</a>,
 which is the device's main light detector.
 
 The <a>Ambient Light Sensor</a> is a [=powerful feature=] that is identified by the
-[=name=] "ambient-light-sensor", which is also its associated
+[=powerful feature/name=] "ambient-light-sensor", which is also its associated
 [=sensor permission name=]. Its [=powerful feature/permission revocation algorithm=] is the
 result of calling the [=generic sensor permission revocation algorithm=] with
 "ambient-light-sensor".