update guidance schedule to correct easter break

Author: Gudkat

data/support-and-assistance.md

@@ -28,7 +28,7 @@ In the table **Campus** means that the guidance session will be on campus, **Dis
 *The schedule is subject to change.*
 
 **Note!** The guidance sessions are not held on the following dates:
-* 17th of April - 23rd of April (Easter break)
+* 21st of April (Easter break)
 * 1st of May (May Day)
 
 #### Discord