Fixing some Javadoc errors

- Cea708 Javadoc references private internals with @link. Doc
  about device accessibility settings doesn't relate to the
  decoder, either.
- Creator Javadoc unnecessary.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=146118092

library/src/main/java/com/google/android/exoplayer2/Format.java

@@ -672,9 +672,6 @@ public final class Format implements Parcelable {
     dest.writeParcelable(metadata, 0);
   }
 
-  /**
-   * {@link Creator} implementation.
-   */
   public static final Creator<Format> CREATOR = new Creator<Format>() {
 
     @Override

library/src/main/java/com/google/android/exoplayer2/text/cea/Cea708Decoder.java

@@ -43,13 +43,6 @@ import java.util.List;
 
 /**
  * A {@link SubtitleDecoder} for CEA-708 (also known as "EIA-708").
- *
- * <p>This implementation does not provide full compatibility with the CEA-708 specification. Note
- * that only the default pen/text and window/cue colors (i.e. text with
- * {@link CueBuilder#COLOR_SOLID_WHITE} foreground and {@link CueBuilder#COLOR_SOLID_BLACK}
- * background, and cues with {@link CueBuilder#COLOR_SOLID_BLACK} fill) will be overridden with
- * device accessibility settings; all others will use the colors and opacity specified by the
- * caption data.
  */
 public final class Cea708Decoder extends CeaDecoder {