Add more descriptive docs

Author: kemzeb

web_src/js/utils/time.js

@@ -7,8 +7,8 @@ dayjs.extend(utc);
 /**
  * Returns an array of millisecond-timestamps of start-of-week days (Sundays)
  *
- * @param startConfig can take any type that `Date` accepts.
- * @param endConfig can take any type that `Date` accepts.
+ * @param startConfig The start date. Can take any type that `Date` accepts.
+ * @param endConfig The end date. Can take any type that `Date` accepts.
  */
 export function startDaysBetween(startConfig, endConfig) {
   const start = dayjs.utc(startConfig);