phpcheck: fall back to sudo for docker automatically

README.md

@@ -20,18 +20,12 @@ run a playbook with sudo:
 ansible-playbook playbooks/<playbook_name>.yml -K
 ```
 
-check PHP versions on hosts and in running Docker containers:
+check PHP versions on hosts and in running Docker containers (falls back to sudo for Docker if needed, add `-K` if sudo requires a password):
 
 ```bash
 ansible-playbook playbooks/phpcheck.yml
 ```
 
-with sudo (e.g. if the user is not in the docker group):
-
-```bash
-ansible-playbook playbooks/phpcheck.yml -K -e phpcheck_become=true
-```
-
 ## WSL Setup Instructions
 
 To use Ansible on Windows, you need to set up Windows Subsystem for Linux (WSL).