Fix the date for the assignment.

Author: janpgit

docs/index.html

@@ -164,8 +164,8 @@ <h2><a name="final_assignment">Final Lab Assignment</a></h2>
 announced otherwise.
 
 <p>The second phase must be finished and handed over to us via e-mail before the
-examination period for the Summer semester starts, i.e. by <b>Monday 23:59, May
-23, 2022, CET</b>.  You need to send the e-mail before the deadline.  The date
+examination period for the Summer semester starts, i.e. by <b>Sunday 23:59, May
+22, 2022, CET</b>.  You need to send the e-mail before the deadline.  The date
 stands even if the semester is prolonged.
 
 <p>The deadlines are hard requirements so stick to the schedule.  We do not