Missing documentation for HashiCorp Vault dynamic database secrets.

[rradecki-migo]

Issue description

Hi,

I tried to find information about HashiCorp Vault support and found:
https://docs.micronaut.io/latest/guide/index.html#distributedConfigurationVault
https://micronaut-projects.github.io/micronaut-discovery-client/latest/guide/configurationreference.html#io.micronaut.discovery.vault.config.VaultClientConfiguration

In configuration properties I do see that vault.client.secret-engine-name is by default set to secret so key value backend may be used. But what about dynamic database secrets described here? Are they supported? Does automatic rotation of database secret work in micronaut-discovery-client? If yes can someone please share an example?

Thank you!