Update heading and task schedule section

Author: cmihaigabriel

_editions/2026/tasks/multisumm.md

@@ -116,7 +116,8 @@ https://aclanthology.org/2020.acl-main.703/
 * Gareth J. F. Jones, Maynooth University, Ireland
 * Anastasia Potyagalova, DCU, Ireland
 
-##### Task 2026 Schedule:
+##### Task Schedule:
+
 * Registration for task participation opens: January 2026
 * Test data release: 1 March 2026
 * Runs due: 1 June 2026
@@ -128,3 +129,4 @@ https://aclanthology.org/2020.acl-main.703/
 
 
 
+