docs: clarify ssh-option flag usage

Author: ibizaman

docs/cli.md

@@ -14,7 +14,8 @@ Options:
 * -p, --ssh-port <ssh_port>
   set the ssh port to connect with
 * --ssh-option <ssh_option>
-  set an ssh option
+  set one ssh option, no need for the '-o' flag, can be repeated.
+  for example: '--ssh-option UserKnownHostsFile=./known_hosts'
 * -L, --print-build-logs
   print full build logs
 * --env-password

docs/reference.md

@@ -35,7 +35,8 @@ Options:
 * -p, --ssh-port <ssh_port>
   set the ssh port to connect with
 * --ssh-option <ssh_option>
-  set an ssh option
+  set one ssh option, no need for the '-o' flag, can be repeated.
+  for example: '--ssh-option UserKnownHostsFile=./known_hosts'
 * -L, --print-build-logs
   print full build logs
 * --env-password

src/nixos-anywhere.sh

@@ -85,7 +85,8 @@ Options:
 * -p, --ssh-port <ssh_port>
   set the ssh port to connect with
 * --ssh-option <ssh_option>
-  set an ssh option
+  set one ssh option, no need for the '-o' flag, can be repeated.
+  for example: '--ssh-option UserKnownHostsFile=./known_hosts'
 * -L, --print-build-logs
   print full build logs
 * --env-password