Update concepts-cluster-management-upgrade.md

Add link to new NFC upgrade.

Author: bartpinto

articles/operator-nexus/concepts-cluster-management-upgrade.md

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 # Operator Nexus Cluster management upgrades
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 Operator Nexus releases various functionality and bug fixes throughout the product lifecycle to update the Azure resources and on-premises extensions, critical in communications back to Azure. 
 
 ## Scope
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 The releases update components on the Cluster Manager to enable new functionality, while maintaining backwards compatibility for the customer. Additionally, new runtime releases are made available and accessed via [Cluster Runtime Upgrades](./howto-cluster-runtime-upgrade.md).
 
 For Compute management, Microsoft delivers new software to the extensions and agents that exist on the platform to provide new functionality and maintain security and communication back to Azure.
 
 ## Delivery
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 The update rolls out to the Azure regions and the Cluster Manager is updated when the release is available in that region.
 
 ## Impact to customer workloads
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 There is no disruption to running workloads or instantiating new workloads, and on-premises resources retain availability throughout the upgrade. Therefore, the customer sees no impact. 
 
 ## Duration of on-premises updates
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 These updates take up to one hour to complete per cluster.
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+## Related Information
+For concepts on Network Fabric management upgrades, see [Azure Operator Nexus Network Fabric management upgrade overview](./concepts-fabric-management-upgrade.md).