Fix seccomp typo

Author: thespad

readme-vars.yml

@@ -31,7 +31,7 @@ param_ports:
   - { external_port: "3000", internal_port: "3000", port_desc: "FileZilla desktop gui." }
 opt_security_opt_param: true
 opt_security_opt_param_vars:
-  - { run_var: "seccomp=unconfined", compose_var: "seccomp:unconfined", desc: "For Docker Engine only, many modern gui apps need this to function as syscalls are unkown to Docker." }
+  - { run_var: "seccomp=unconfined", compose_var: "seccomp:unconfined", desc: "For Docker Engine only, many modern gui apps need this to function on older hosts as syscalls are unknown to Docker." }
 
 # application setup block
 app_setup_block_enabled: true