HDR: Remove comment explaining force sdr behavior with assetloaders.

Before, if the upstream AssetLoader provides HDR to the VideoSamplePipeline when
HDR_MODE_EXPERIMENTAL_FORCE_INTERPRET_HDR_AS_SDR is requested, the
VideoSamplePipeline would attempt to tell the AssetLoader to output SDR, which
could be accomplished via MediaCodec tone-mapping in the AssetLoader.

However, this makes an assumption of the AssetLoader implementation, and
AssetLoaders may not all implement support for decoder tone-mapping. Remove javadoc
attempting to explain how AssetLoaders (ex. custom ones) could behave.

PiperOrigin-RevId: 510956820

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/Transformer.java

@@ -136,14 +136,6 @@ public final class Transformer {
      * Listener#onFallbackApplied(Composition, TransformationRequest, TransformationRequest)} will
      * Listener#onFallbackApplied(Composition, TransformationRequest, TransformationRequest)} will
      * be invoked with the actual applied values.
      * be invoked with the actual applied values.
      *
      *
-     * <p>If {@link TransformationRequest#hdrMode} is set to {@link
-     * TransformationRequest#HDR_MODE_EXPERIMENTAL_FORCE_INTERPRET_HDR_AS_SDR} and an {@link
-     * #setAssetLoaderFactory AssetLoader.Factory} is set, {@link TransformationRequest#hdrMode}
-     * will be ignored. In this case, if the {@link AssetLoader.Factory} passed produces HDR data,
-     * it will be automatically {@linkplain
-     * TransformationRequest#HDR_MODE_TONE_MAP_HDR_TO_SDR_USING_MEDIACODEC tone mapped to SDR using
-     * MediaCodec}.
-     *
      * @param transformationRequest The {@link TransformationRequest}.
      * @param transformationRequest The {@link TransformationRequest}.
      * @return This builder.
      * @return This builder.
      */
      */