Update reduction-workflow-guidelines.md change date

Author: SimonHeybrock

docs/user-guide/reduction-workflow-guidelines.md

@@ -3,7 +3,7 @@
 ## About
 
 - Version: 1
-- Last update: 2024-02-26
+- Last update: 2024-05
 
 ## Introduction
 
@@ -278,4 +278,4 @@ Not all guidelines are testable.
 
 **Reason** Unit tests for providers are easier to write and maintain than for entire workflows.
 
-**Note** This does not mean that we should not write tests for entire workflows, but that we should also write tests for providers.
+**Note** This does not mean that we should not write tests for entire workflows, but that we should also write tests for providers.