Corrected private -> public in datamover.md.

doc.zih.tu-dresden.de/docs/data_transfer/datamover.md

@@ -70,7 +70,7 @@ To identify the mount points of the different filesystems on the data transfer m
 
 ## Transferring Files Between ZIH Systems and Group Drive
 
-1. Copy your private SSH key from ZIH system to `login1.zih.tu-dresden.de`.
+1. Copy your public SSH key from ZIH system to `login1.zih.tu-dresden.de`.
 
    ``` console
    marie@login$ ssh-copy-id -i ~/.ssh/id_rsa.pub login1.zih.tu-dresden.de