Improve TelecomManager#addNewIncomingCall API docs.

Make it more clear how to specify an anonymous call and its associated
presentation.

Test: docs only change.
Bug: 257534258
Change-Id: Ieb44fe8c9de954eabfda0d959fe529d63b53f72d

telecomm/java/android/telecom/TelecomManager.java

@@ -2043,6 +2043,14 @@ public class TelecomManager {
      * {@link #getPhoneAccount}. Self-managed {@link ConnectionService}s must have
      * {@link android.Manifest.permission#MANAGE_OWN_CALLS} to add a new incoming call.
      * <p>
+     * Specify the address associated with the incoming call using
+     * {@link #EXTRA_INCOMING_CALL_ADDRESS}.  If an incoming call is from an anonymous source, omit
+     * this extra and ensure you specify a valid number presentation via
+     * {@link Connection#setAddress(Uri, int)} on the {@link Connection} instance you return in
+     * your
+     * {@link ConnectionService#onCreateIncomingConnection(PhoneAccountHandle, ConnectionRequest)}
+     * implementation.
+     * <p>
      * The incoming call you are adding is assumed to have a video state of
      * {@link VideoProfile#STATE_AUDIO_ONLY}, unless the extra value
      * {@link #EXTRA_INCOMING_VIDEO_STATE} is specified.