fixed up link

docs/lab-examples/cvx04.md

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 The lab is a multi-node topology that consists of two racks with two dual-homed servers connected with a leaf-spine network.
 
 
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 ## Use cases
 This is a "Cumulus In The Cloud" topology designed to demonstrate some of the advanced features of Cumulus Linux. It is based on the [original CITC demo environment](https://www.nvidia.com/en-gb/networking/network-simulation/) with the only exception being the reduced number of spine switches (2 instead of 4). The topology can be spun up fully provisioned with the following two configuration options: