Update documentation to remove exception that is not throw
Test: Manual
RelNote: Documentation update

Change-Id: Iadc92e7054405b82bbef234c999253b62aab5649
diff --git a/car/app/app/src/main/java/androidx/car/app/media/MediaPlaybackManager.java b/car/app/app/src/main/java/androidx/car/app/media/MediaPlaybackManager.java
index 8a1da03..12f16d1 100644
--- a/car/app/app/src/main/java/androidx/car/app/media/MediaPlaybackManager.java
+++ b/car/app/app/src/main/java/androidx/car/app/media/MediaPlaybackManager.java
@@ -29,7 +29,6 @@
 import androidx.annotation.RestrictTo;
 import androidx.car.app.CarContext;
 import androidx.car.app.HostDispatcher;
-import androidx.car.app.HostException;
 import androidx.car.app.annotations.ExperimentalCarApi;
 import androidx.car.app.managers.Manager;
 import androidx.car.app.serialization.Bundleable;
@@ -54,8 +53,6 @@
      * allow the host to read the media session playback state.
      *
      * @param token to be sent to the host
-     * @throws HostException            if the call is invoked by an app that is not declared as
-     *                                  a navigation app in the manifest
      * @throws IllegalArgumentException if any of the token cannot be serialized
      * @throws IllegalStateException    if this is not called from the main thread.
      */