[Bug-wget] typo in comment for function update_speed_ring()

[Yi Li]

Hi list,
       speed ring is 20 records, so even for slow downloads,
there could at most take *twenty* reads time. but in the comment for
function update_speed_ring() , the comment is :

* The idea is that for fast downloads, we get the speed over exactly*
*   the last three seconds.  For slow downloads (where a network read*
*   takes more than 150ms to complete), we get the speed over a larger*
*   time period, as large as it takes to complete thirty reads.  This*
*   is good because slow downloads tend to fluctuate more and a*
*   3-second average would be too erratic.  */*


it should be change into :


*   time period, as large as it takes to complete twenty reads.  This*


Thanks,
Yi