remote shell em(COMMMAND) will be used to run an rsync server on the
remote host, and all data will be transmitted through that remote
shell connection, rather than through a direct socket connection to a
-running rsync server on the remote host.
+running rsync server on the remote host. See the section "CONNECTING
+TO AN RSYNC SERVER OVER A REMOTE SHELL PROGRAM" above.
Command-line arguments are permitted in COMMAND provided that COMMAND is
presented to rsync as a single argument. For example: