RHIDP-6130 Update docs to refer to new secret name

Author: GitHub Actions

modules/configuring-external-databases/proc-configuring-postgresql-instance-using-helm.adoc

@@ -136,7 +136,7 @@ upstream:
         name: dynamic-plugins
         optional: true
       name: dynamic-plugins
-    - name: `_<release_name>_-dynamic-plugins-npmrc`
+    - name: dynamic-plugins-npmrc
       secret:
         defaultMode: 420
         optional: true