Clarify required ansible prefix in comments if adding become_password to hosts file.

examples/hosts

@@ -3,7 +3,7 @@
 #
 # To connect using a non-root user (and elevate to root with sudo later),
 # replace `ansible_ssh_user=root` with something like this: `ansible_ssh_user=username ansible_become=true ansible_become_user=root`.
-# If sudo requires a password, either add `become_password=PASSWORD_HERE` to the host line
+# If sudo requires a password, either add `ansible_become_password=PASSWORD_HERE` to the host line
 # or tell Ansible to ask you for the password interactively by adding a `--ask-become-pass` (`-K`) flag to all `ansible-playbook` (or `just`) commands.
 #
 # For improved Ansible performance, SSH pipelining is enabled by default in `ansible.cfg`.