Azure Virtual Network App (#4982)

* added collection section for virtual network app

* Apply suggestions from code review

Co-authored-by: Kim (Sumo Logic) <[email protected]>

* added dashboard description and usecases

* Update azure-virtual-network.md

made a few grammatical checks.

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Co-authored-by: Kim (Sumo Logic) <[email protected]>
Co-authored-by: Amee Lepcha <[email protected]>

Author: 3 people