Fix repeated segments

src/util/media-sequence-sync.js

@@ -53,8 +53,8 @@
 class SyncInfoData {
   /**
    *
-   * @param {SyncInfo} segmentSyncInfo
-   * @param {Array<SyncInfo>} [partsSyncInfo]
+   * @param {SyncInfo} segmentSyncInfo - sync info for a give segment
+   * @param {Array<SyncInfo>} [partsSyncInfo] - sync infos for a list of parts for a given segment
    */
   constructor(segmentSyncInfo, partsSyncInfo = []) {
     this.segmentSyncInfo_ = segmentSyncInfo;
@@ -69,8 +69,8 @@
     return this.partsSyncInfo_;
   }
 
   get hasPartsSyncInfo() {
     return this.partsSyncInfo_.length > 0;
   }
 
   resetAppendStatus() {
@@ -96,8 +96,8 @@
     return this.start_;
   }
 
   get end() {
     return this.end_;
   }
 
   get diagnostics() {