Update docs/modules/opa/pages/usage-guide/tls.adoc

Co-authored-by: Malte Sander <contact@maltesander.com>

Author: dervoeti

docs/modules/opa/pages/usage-guide/tls.adoc

@@ -8,7 +8,7 @@ TLS encryption for securing client connections to the OPA server can be configur
 TLS encryption in OPA is disabled by default. To enable it, you need to:
 
 1. Create a `SecretClass` that provides TLS certificates
-2. Reference the `SecretClass` in your `OpaCluster` specification
+2. Reference the `SecretClass` in your `OpaCluster` custom resource
 
 The operator integrates with the xref:secret-operator:index.adoc[Secret Operator] to automatically provision and mount TLS certificates to the OPA pods.