Add ssh to supported protocols

Author: mickenordin

spec.yaml

@@ -591,7 +591,8 @@ components:
           description: |
             JSON object with specific options for each protocol.
             The supported protocols are:
-            - `webdav`, to access the data
+            - `webdav`, to access the data via WebDAV
+            - `ssh`, to access the data via SFTP/SCP
             - `webapp`, to access remote web applications
             Other custom protocols might be added in the future.
           required: