Add note on naming of workspaces

doc.zih.tu-dresden.de/docs/data_lifecycle/workspaces.md

@@ -95,10 +95,16 @@ Options:
 This will create a workspace with the name `test-workspace` on the `/scratch` filesystem for 90
 days with an email reminder for 7 days before the expiration.
 
-!!! Note
+!!! Note "Email reminder"
 
     Setting the reminder to `7` means you will get a reminder email on every day starting `7` days
-    prior to expiration date.
+    prior to expiration date. We strongly recommend to set this email reminder.
+
+!!! Note "Name of a workspace"
+
+   The workspace should help you to remember the experiment and data stored here. It has to be
+   unique on a certain filesystem. On the other hand it is possible to use the very same name for
+   workspaces on different filesystems. 
 
 ### Extension of a Workspace