Fix spelling: It is plural

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

@@ -325,7 +325,7 @@ ws_send_ical --filesystem horse --mail <your.email>@tu-dresden.de --workspace te
 ### Deletion of a Workspace
 
 There is an [Expire process](#expire-process) for every workspace filesystem running on a daily
-basis. This processes check the lifetime of all workspaces and move expired workspaces into the
+basis. These processes check the lifetime of all workspaces and move expired workspaces into the
 grace period.
 
 In addition to this automatic process, you also have the option of **explicitly releasing