Description of problem:
When upgrading ocp-3.6 with embedded etcd to ocp-3.7, openshift-ansible will abort and prompt the following failure msg:

TASK [Evaluate groups - Fail if no etcd hosts group is defined] *************************************************************************************************************
fatal: [localhost]: FAILED! => {"changed": false, "failed": true, "msg": "Running etcd as an embedded service is no longer supported. If this is a new install please define an 'etcd' group with either one, three or five hosts. These hosts may be the same hosts as your masters. If this is an upgrade please see https://docs.openshift.com/container-platform/latest/install_config/upgrading/migrating_embedded_etcd.html for documentation on how to migrate from embedded to external etcd.\n"}
	to retry, use: --limit @/usr/share/ansible/openshift-ansible/playbooks/byo/openshift-cluster/upgrades/v3_7/upgrade.retry


But when visiting the URL "https://docs.openshift.com/container-platform/latest/install_config/upgrading/migrating_embedded_etcd.html", it shows

Not found
Sorry, but the page you were trying to view does not exist


The correct address should be "https://docs.openshift.com/container-platform/3.7/upgrading/migrating_embedded_etcd.html"



Version-Release number of the following components:
openshift-ansible-playbooks-3.7.46-1.git.0.37f607e.el7.noarch


How reproducible:

Steps to Reproduce:
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Actual results:
Please include the entire output from the last TASK line through the end of output if an error is generated

Expected results:

Additional info:
Please attach logs from ansible-playbook with the -vvv flag