Clarify API docs for setShouldScreenCallViaAudioProcessing.

Make it clear that this is only visible to the system dialer.

Test: Build docs
Fixes: 186671257
Change-Id: Ia4633d010ab7d48a7bae0afe3bd32bc9f16447d4

telecomm/java/android/telecom/CallScreeningService.java

@@ -305,7 +305,7 @@ public abstract class CallScreeningService extends Service {
              * called with {@code false}, and all other parameters in this builder will be ignored.
              * <p>
              * This request will only be honored if the {@link CallScreeningService} shares the same
-             * uid as the default dialer app. Otherwise, the call will go through as usual.
+             * uid as the system dialer app. Otherwise, the call will go through as usual.
              * <p>
              * Apps built with SDK version {@link android.os.Build.VERSION_CODES#R} or later which
              * are using the microphone as part of audio processing should specify the