fix OIDC_HOSTNAME_CHOICE description (#847)

Author: drewmullen

content/terraform-enterprise/1.0.x/docs/enterprise/deploy/reference/configuration.mdx

@@ -403,7 +403,7 @@ Default is `false`.
 Specifies which hostname Terraform Enterprise should use to federate OIDC workloads for OIDC-related integrations. You can specify one of the following values:
 
 - `primary`: Terraform Enterprise uses the hostname specified in the [`TFE_HOSTNAME`](#tfe_hostname) setting.
-- `secondary`: Terraform Enterprise uses the hostname specified in the [`TFE_HOSTNAME`](#tfe_hostname_secondary) setting.
+- `secondary`: Terraform Enterprise uses the hostname specified in the [`TFE_HOSTNAME_SECONDARY`](#tfe_hostname_secondary) setting.
 
 Default is `primary`.