[doc] ref doc issues in @azure/keyvault-secrets

## invalid link

`-Key` in the linked operations probably should be `-Secret`
> sdk/keyvault/keyvault-secrets/src/secretsModels.ts:205: * passed to {@link beginDeleteSecret} and {@link beginRecoverDeletedKey}.

- `-Options` should be removed?
> sdk/keyvault/keyvault-secrets/src/secretsModels.ts:304: * Options for {@link backupSecretOptions}.
