Fix a stay 'six' into 'eight'

Author: zoran-rilak-msft

azure-sql/managed-instance/vnet-subnet-determine-size.md

@@ -48,7 +48,7 @@ Use the following list of considerations when determining the size of your subne
 Use the following parameters to help form a calculation:
 
 - Azure uses five IP addresses in the subnet for its own needs.
-- Each [VM group](virtual-cluster-architecture.md#number-of-vm-groups) allocates six more addresses.
+- Each [VM group](virtual-cluster-architecture.md#number-of-vm-groups) allocates eight more addresses.
 - The number of addresses that each SQL managed instance uses, depends on the service tier.
   - General Purpose SQL managed instance uses three addresses
   - Business Critical SQL managed instance uses five addresses