fix(doc): admin urls

Update 60_admin-server.adoc (missing /admin prefix)

Signed-off-by: Jérôme Prudent <[email protected]>

modules/docs/src/docs/user-guide/20_features/60_admin-server.adoc

@@ -22,9 +22,9 @@ The configuration is described in the xref:10_configuration.adoc#admin-configura
 
 By default, the administration server is available on port `19876` and exposes the following endpoints:
 
-* `GET /probes/healthz`: the liveness probe.
+* `GET /admin/probes/healthz`: the liveness probe.
 It always returns `200 OK` and can be used to check if the server is running.
-* `GET /probes/health`: the readiness probe.
+* `GET /admin/probes/health`: the readiness probe.
 It returns `200 OK` if the server is ready to handle requests and all probes are successful.
 See the xref:30_probes.adoc[Probes] section for more details.
 
@@ -33,4 +33,4 @@ See the xref:../30_modules/30_flags.adoc[Flags] section for the feature flags en
 
 === Defining administration endpoints
 
-You can define administration endpoints easily by defining an `adminControllers` property in your `App`.
+You can define administration endpoints easily by defining an `adminControllers` property in your `App`.