ksmbd: update SMB3 multi-channel support in ksmbd.rst

ksmbd start supporting SMB3 Multi-channel feature. Mark it as Partially
supported till replay/retry mechanisms are implemented.
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

Documentation/filesystems/cifs/ksmbd.rst

@@ -84,7 +84,8 @@ SMB3 encryption(CCM, GCM)      Supported. (CCM and GCM128 supported, GCM256 in
                                progress)
 SMB direct(RDMA)               Partially Supported. SMB3 Multi-channel is
                                required to connect to Windows client.
-SMB3 Multi-channel             In Progress.
+SMB3 Multi-channel             Partially Supported. Planned to implement
+                               replay/retry mechanisms for future.
 SMB3.1.1 POSIX extension       Supported.
 ACLs                           Partially Supported. only DACLs available, SACLs
                                (auditing) is planned for the future. For