Update how-to-leverage-virtual-tpms-in-azure-confidential-vms.md

explaining what IMDS is

Author: simranparkhe

articles/confidential-computing/how-to-leverage-virtual-tpms-in-azure-confidential-vms.md

@@ -47,7 +47,7 @@ These steps list out which artifacts you need and how to get them:
 
     The AMD Versioned Chip Endorsement Key (VCEK) is used to sign the AMD SEV-SNP report. The VCEK certificate allows you to verify that the report was signed by a genuine AMD CPU key. There are two ways retrieve the certificate:
 
-    a.	Obtain the VCEK certificate by running the following command – it obtains the cert from a well-known IMDS endpoint: 
+    a.	Obtain the VCEK certificate by running the following command – it obtains the cert from a well-known [Azure Instance Metadata Service](/azure/virtual-machines/instance-metadata-service) (IMDS) endpoint: 
     ```bash
     curl -H Metadata:true http://169.254.169.254/metadata/THIM/amd/certification > vcek
     cat ./vcek | jq -r '.vcekCert , .certificateChain' > ./vcek.pem