document key generation

ssh-jump-host/values.yaml

@@ -135,7 +135,7 @@ configs:
 
 hostKeys:
   name: ssh-host-keys # secret name
-  data: # At least one key pair MUST be added to successfully start the server
+  data: # At least one key pair MUST be added to successfully start the server, can be generated with `ssh-keygen -t [algorithm] -f [filename]`. For rsa, `-b 4096` is recommended
     ssh_host_ecdsa_key: ''
     ssh_host_ecdsa_key.pub: ''
     ssh_host_ed25519_key: ''