Make type of array of objects compatible with JSDoc and TSDoc.

The best TSDoc type is (Text|HTMLElement)[], but to JSDoc the array is
not distributive. JSDoc prefers Text[]|HTMLElement[], but TSDoc
rejects that syntax. In the end, both are fine with
Array.<Text|HTMLElement>.

static/sfu.js

@@ -1446,7 +1446,7 @@ const urlRegexp = /https?:\/\/[-a-zA-Z0-9@:%/._\\+~#&()=?]+[-a-zA-Z0-9@:%/_\\+~#
 
 /**
  * @param {string} line
- * @returns {(Text|HTMLElement)[]}
+ * @returns {Array.<Text|HTMLElement>}
  */
 function formatLine(line) {
     let r = new RegExp(urlRegexp);