add information about final assignment spec

Author: vladak

docs/index.html

@@ -126,6 +126,8 @@ <h2><a name="final_assignment">Final Lab Assignment</a></h2>
 <p>The final lab assignment you need to implement to get credits for the
 labs (which is a hard dependency for entering the credits that you get for
 passing the exam into the school information system).
+
+The specification of the assignment will be provided before the end of October 2023.
 <!--  
   is 
 <a href="./class-assignments/labs-assignment-2023.md">a simple MQTT broker</a>.