Change ContrastProcessor java doc for consistency.

PiperOrigin-RevId: 474002026
(cherry picked from commit 7c435621)

google3/third_party/java_src/android_libs/media/libraries/effect/src/main/java/androidx/media3/effect/ContrastProcessor.java

@@ -25,7 +25,7 @@ import com.google.android.exoplayer2.util.GlProgram;
 import com.google.android.exoplayer2.util.GlUtil;
 import java.io.IOException;
 
-/** Contrast processor to apply a {@link Contrast} to each frame. */
+/** Applies a {@link Contrast} to each frame in the fragment shader. */
 /* package */ final class ContrastProcessor extends SingleFrameGlTextureProcessor {
   private static final String VERTEX_SHADER_PATH = "shaders/vertex_shader_transformation_es2.glsl";
   private static final String FRAGMENT_SHADER_PATH = "shaders/fragment_shader_contrast_es2.glsl";