docs(step_acme_cert): remove user permission bit

roles/step_acme_cert/README.md

@@ -30,7 +30,7 @@ before setting up a renewal service using `step-cli ca renew`s `--daemon` mode.
 - Required: Yes
 
 ##### `step_acme_cert_webroot_path`
-- If set, this role will use `step-cli`s webroot mode to get a new certificate. You need to make sure that `step_service_user` has write permissions in this directory.
+- If set, this role will use `step-cli`s webroot mode to get a new certificate.
 - If empty, this role will use the standalone mode instead, causing `step-cli` to bind itself to port 80. Make sure that no other services are listening on this port.
   Note that `step-cli` only needs to bind to this port when getting a *new* certificate. It does not need to bind if it is only *renewing* a certificate.
 - Default: ""