What you have in the docops link is correct and the only product documentation we have for the integration. However there are two knowledgebase docs for two scenarios of an error that may be seen:
Unable to Integrate ServiceNow, get an error - Please check the configuration for ServiceNow(ServiceNow)
Integration ServiceNow error fails check configuration Proxy server communication Spectrum
Last Update: 2017-07-20 Size: 83 kb Type: Knowledge Base Articles ID: TEC1175159
Error: Please check the configuration for ServiceNow (ServiceNow)
Integration error ServiceNow OneClick configuration Service Desk Server Name error
Last Update: 2017-03-10 Size: 83 kb Type: Knowledge Base Articles ID: TEC1733407
Other customers may have additional documentation for you.
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Rene'