lecture-prologue: Updated the exercise registration information as di…

…scussed in MS Teams

lecture/1-prologue/1-prologue.tex

@@ -204,7 +204,7 @@
 
 	\begin{block}{Registration for Exercises}
 		Registration for exercises is mandatory to ensure an appropriate support to questions regarding setting of exercises should they arise.
-			{\color{faured}Registration opens at April 25th, 18:00 o'clock via StudOn.}
+			{\color{faured}Registration opens at April 21th, 14:00 o'clock via StudOn.}
 	\end{block}
 \end{frame}