cloud-provider-openstack
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[docs] add more uses cases to node-selector service annotation
What this PR does / why we need it:
Add more context about the node-selector service annotation and how to use it in combination with the node.kubernetes.io/exclude-from-external-load-balancers node label.
Which issue this PR fixes(if applicable): fixes #
Special notes for reviewers:
See also #2601
Release note:
NONE