Document Microsoft Teams infrastructure locations for GCC High

Added information about Microsoft Teams infrastructure locations for GCC High Gov cloud.

One of our large USGOV cloud customers, RTX, is requesting we update our Microsoft documentation to reflect that our Teams infrastructure for USGOV cloud is not located in region USGOV Virginia and only in USGOV Texas and Arizona.
 
They would simply like a 'Note' stating as such for their training purposes.  Through Kusto querying they noted all routing for Media Processors travel to AZ and TX only.

Author: tsweatman1

microsoft-365/enterprise/microsoft-365-u-s-government-gcc-high-endpoints.md

@@ -79,3 +79,5 @@ Notes for this table:
 - The Security and Compliance Center (SCC) provides support for Azure ExpressRoute for Microsoft 365. The same applies for many features exposed through the SCC such as Reporting, Auditing, eDiscovery (Premium), Unified DLP, and Data Governance. Two specific features, PST Import and eDiscovery Export, currently don't support Azure ExpressRoute with only Microsoft 365 route filters due to their dependency on Azure Blob Storage. To consume those features, you need separate connectivity to Azure Blob Storage using any supportable Azure connectivity options, which include Internet connectivity or Azure ExpressRoute with Azure Public route filters. You have to evaluate establishing such connectivity for both of those features. The Microsoft 365 Information Protection team is aware of this limitation and is actively working to bring support for Azure ExpressRoute for Microsoft 365 as limited to Microsoft 365 route filters for both of those features.
 
 - There are other optional endpoints for Microsoft 365 Apps for enterprise that aren't listed and aren't required for users to launch Microsoft 365 Apps for enterprise applications and edit documents. Optional endpoints are hosted in Microsoft data centers and don't process, transmit, or store customer data. We recommend that user connections to these endpoints be directed to the default Internet egress perimeter.
+
+- Microsoft Teams infrastructure for GCC High Gov cloud is located in USGov Arizona and USGov Texas regions.