Minor adjustments

Author: Techassi

modules/concepts/pages/duration.adoc

@@ -8,14 +8,16 @@
 All Stackable operators use a human-readable duration format. It very closely resembles the format used by the {go}[Go] programming language - which Kubernetes uses internally.
 Every duration field of a {k8s-cr}[CustomResource], for example the xref:trino:usage-guide/operations/graceful-shutdown.adoc[`spec.workers.roleConfig.gracefulShutdownTimeout`] field, supports this format.
 There is no official format specification, but the source code of {go-std-time}[`time.ParseDuration`] in the Go standard library can be used as an implementation reference.
-The format looks like this:
+The format looks like this: `15d18h34m42s`.
+xref:trino:index.adoc[Trino], for example, uses the format like this:
 
 [source,yaml]
 ----
 # ...
 spec:
-  clusterConfig:
-    gracefulShutdownTimeout: 15d18h34m42s
+  workers:
+    roleConfig:
+      gracefulShutdownTimeout: 15d18h34m42s
 ----
 
 Valid time units are: `d`, `h`, `m`, `s`, and `ms`.