docs: fix typo in interface_config.js

interface_config.js

     LOCAL_THUMBNAIL_RATIO: 16 / 9, // 16:9
 
     /**
-     * Maximum coeficient of the ratio of the large video to the visible area
+     * Maximum coefficient of the ratio of the large video to the visible area
      * after the large video is scaled to fit the window.
      *
      * @type {number}