We want to document changes made in Netconf 6 regarding swagger/openapi installation and usage. For details see: https://lists.opendaylight.org/g/Discuss/message/8979.

Proceed by following steps (create separate patches):

1. Fix usage guidelines found by: https://docs.opendaylight.org/en/latest/search.html?q=apidoc

1. Add dedicated paragraph into Netconf user guide at https://docs.opendaylight.org/projects/netconf/en/latest/user-guide.html