test: finish test 2

Author: durran

source/client-side-encryption/tests/README.md

@@ -3717,9 +3717,9 @@ class ClientEncryptionOpts {
    keyVaultClient: <setupClient>,
    keyVaultNamespace: "keyvault.datakeys",
    kmsProviders: { "aws": {} },
-   credentialProviders: { "aws": <default provider from AWS SDK> }
+   credentialProviders: { "aws": <object/function that returns valid credentials from the environment> }
 }
 ```
 
 Use the client encryption to create a datakey using the "aws" KMS provider. This should successfully load and use the
-AWS credentials that were defined in the environment.
+AWS credentials that were defined in the environment. Assert the datakey was created.