Description of problem:
In the docs here for overcloud update run
https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/13/html/keeping_red_hat_openstack_platform_updated/assembly-updating_the_overcloud#updating_all_controller_nodes

It should be mentioned that update has to be run per role name.

For example, user can have a role named NFVCompute in which case the update run command needs to be  openstack overcloud update run --nodes NFVCompute

Version-Release number of selected component (if applicable):
13

How reproducible:
100%

Steps to Reproduce:
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Actual results:


Expected results:


Additional info: