Update about-fastpath.md

Note that PE connectivity to peered/spoke VNet is not supported.

Author: mialdrid

articles/expressroute/about-fastpath.md

@@ -105,6 +105,7 @@ FastPath Private endpoint/Private Link connectivity is supported for the followi
 > [!NOTE]
 > * Enabling FastPath Private endpoint/Link support for limited GA scenarios may take upwards of 2 weeks to complete. Please plan your deployment(s) in advance.
 > * Connections associated to ExpressRoute partner circuits aren't eligible for this preview. Both IPv4 and IPv6 connectivity is supported.
+> * FastPath connectivity to a Private endpoint/Link service deployed to a spoke Virtual Network, peered to the Hub Virtual Network (where the ExpressRoute Virtual Network Gateway is deployed), is not supported. FastPath only supports connectivity to Private Endpoints/Link services deployed to the Hub Virtual Network.
 > * Private Link pricing will not apply to traffic sent over ExpressRoute FastPath. For more information about pricing, check out the [Private Link pricing page](https://azure.microsoft.com/pricing/details/private-link/).
 > * FastPath supports a max of 100Gbps connectivity to a single Availability Zone (Az).