Add section on connecting to multiple API ML gateways using team config

[adam-wolfe]

Is your request for enhancement related to a problem? Please describe.

For the V3 docs, we should add documentation for making a team config that can be used in Zowe Explorer to access services through multiple API ML gateways.

Describe the solution you'd like

Add a section to the "Team configuration for team leaders" page that shows how to make a nested config that connects to multiple API ML gateways.

Related doc pages

https://docs.zowe.org/stable/user-guide/cli-using-team-configuration-team-leaders/#profile-scenarios

Additional context