Reword javadoc of TracksInfo.isTypeSupportedOrEmpty

The existing wording would be correct if prefixed with
"Returns false if [...]", but it seems confusing to a document a boolean
method in terms the condition it returns false - so I reworded it in
terms of when it returns true.

#minor-release

PiperOrigin-RevId: 421682584

library/common/src/main/java/com/google/android/exoplayer2/TracksInfo.java

@@ -225,7 +225,10 @@ public final class TracksInfo implements Bundleable {
     return trackGroupInfos;
     return trackGroupInfos;
   }
   }
 
 
-  /** Returns if there is at least one track of type {@code trackType} but none are supported. */
+  /**
+   * Returns true if at least one track of type {@code trackType} is {@link
+   * TrackGroupInfo#isTrackSupported(int) supported}, or there are no tracks of this type.
+   */
   public boolean isTypeSupportedOrEmpty(@C.TrackType int trackType) {
   public boolean isTypeSupportedOrEmpty(@C.TrackType int trackType) {
     boolean supported = true;
     boolean supported = true;
     for (int i = 0; i < trackGroupInfos.size(); i++) {
     for (int i = 0; i < trackGroupInfos.size(); i++) {
@@ -240,7 +243,7 @@ public final class TracksInfo implements Bundleable {
     return supported;
     return supported;
   }
   }
 
 
-  /** Returns if at least one track of the type {@code trackType} is selected for playback. */
+  /** Returns true if at least one track of the type {@code trackType} is selected for playback. */
   public boolean isTypeSelected(@C.TrackType int trackType) {
   public boolean isTypeSelected(@C.TrackType int trackType) {
     for (int i = 0; i < trackGroupInfos.size(); i++) {
     for (int i = 0; i < trackGroupInfos.size(); i++) {
       TrackGroupInfo trackGroupInfo = trackGroupInfos.get(i);
       TrackGroupInfo trackGroupInfo = trackGroupInfos.get(i);