initrd: Remove mention of USE_DOCKER
Removed `USE_DOCKER` from the initrd builder usage statement as that
builder does not use Docker.
@@ -36,9 +36,6 @@ Extra environment variables:
DEFAULT: kata-agent
AGENT_INIT: use kata agent as init process
DEFAULT: no
- USE_DOCKER: If set, the image builds in a Docker Container. Setting
- this variable requires Docker.
- DEFAULT: not set
EOT
exit "${error}"
}
