docs: clarify shell_type = none and ssh = behaviour

Discussed on the forum:

https://forum.rclone.org/t/can-rclone-be-made-to-work-with-an-sftp-server-confining-users-to-an-sftp-jail-and-no-login/44931
This commit is contained in:
kapitainsky 2024-03-21 11:55:20 +00:00 committed by albertony
parent 7803b4ed6c
commit 2591703494

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@ -279,6 +279,8 @@ option before first run, the auto-detection will be skipped, and if
you set a different value later this will override any existing.
Value `none` can be set to avoid any attempts at executing shell
commands, e.g. if this is not allowed on the server.
If you have `shell_type = none` in the configuration then
the [ssh](#sftp-ssh) must not be set.
When the server is [rclone serve sftp](/commands/rclone_serve_sftp/),
the rclone SFTP remote will detect this as a Unix type shell - even