Appended network best practices for APIM in multi-region setup

[thahif]

Added following best practices for APIM in multi-region setup.

Best Practice:

Use Azure API management(APIM) premium tier to build multi-region gateway setup. In the event of a disaster, route the traffic to a healthy region.
Use Azure Traffic manager in conjunction with APIM to either route requests to a regional gateway or Geographic routing method in multi-region deployment scenario.

For single region scenario, deploy APIM in Availability zone configuration with automatic zone selection.

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