Removing manifest from payload

The manifest is not needed. We remove it from the spec but forgot to remove it from the sample payload

Author: jcruiz

articles/active-directory/verifiable-credentials/issuance-request-api.md

@@ -86,7 +86,6 @@ The issuance request payload contains information about your verifiable credenti
     },
     "issuance": {
         "type": "VerifiedCredentialExpert",
-        "manifest": "https://beta.did.msidentity.com/v1.0/12345678-0000-0000-0000-000000000000/verifiableCredential/contracts/VerifiedCredentialExpert1",
         "pin": {
             "value": "3539",
             "length": 4