Optimize bilibiliDanmuParseFromUrl function in artplayer-plugin-danmuku

docs/uncompiled/artplayer-plugin-danmuku/index.js

@@ -406,6 +406,7 @@ class Danmuku {
         });
         return result;
     }
+    // 计算弹幕速度
     get speed() {
         return this.option.synchronousPlayback && this.art.playbackRate ? this.option.speed / Number(this.art.playbackRate) : this.option.speed;
     }