Move documentation in common that linked to core classes

This will allow moving Player in common.

#player-to-common

PiperOrigin-RevId: 347797285

library/core/src/main/java/com/google/android/exoplayer2/Player.java

@@ -1431,7 +1431,9 @@ public interface Player {
   /**
    * Returns the track type that the renderer at a given index handles.
    *
-   * @see Renderer#getTrackType()
+   * <p>For example, a video renderer will return {@link C#TRACK_TYPE_VIDEO}, an audio renderer will
+   * return {@link C#TRACK_TYPE_AUDIO} and a text renderer will return {@link C#TRACK_TYPE_TEXT}.
+   *
    * @param index The index of the renderer.
    * @return One of the {@code TRACK_TYPE_*} constants defined in {@link C}.
    */

library/core/src/main/java/com/google/android/exoplayer2/Renderer.java

@@ -237,10 +237,9 @@ public interface Renderer extends PlayerMessage.Target {
   String getName();
 
   /**
-   * Returns the track type that the renderer handles. For example, a video renderer will return
-   * {@link C#TRACK_TYPE_VIDEO}, an audio renderer will return {@link C#TRACK_TYPE_AUDIO}, a text
-   * renderer will return {@link C#TRACK_TYPE_TEXT}, and so on.
+   * Returns the track type that the renderer handles.
    *
+   * @see Player#getRendererType(int)
    * @return One of the {@code TRACK_TYPE_*} constants defined in {@link C}.
    */
   int getTrackType();