Updates to the doc
```
Add appropriate Key Vault access policies to allow the service principal access to this Key Vault
- (TODO: Need to add instruction if using Managed Identity)
```shell
az keyvault set-policy --name "OperatorSecretKeyVault" --spn <AZURE_CLIENT_ID> --secret-permissions get list delete set
```
+ If you use Managed Identity instead of Service Principal, use the Client ID of the Managed Identity instead in the above command.
+
+ ```shell
+ az keyvault set-policy --name "OperatorSecretKeyVault" --spn <MANAGEDIDENTITY_CLIENT_ID> --secret-permissions get list delete set
+ ```
+
Set the additional environment variable 'AZURE_OPERATOR_KEYVAULT' to indicate you want to use Key Vault for secrets.
```shell
