[stable/jenkins] Update jenkins README.MD with right default values (#19698)

* Update READ.ME

Changing the default value for master.enableXmlConfig on READ.ME acording to values.yaml

Signed-off-by: Mateus Miranda <mateusmiranda@gmail.com>

* Bumping jenkins chart version

Signed-off-by: Mateus Miranda <mateus.miranda@sumup.com>

stable/jenkins/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 name: jenkins
 home: https://jenkins.io/
-version: 1.9.10
+version: 1.9.11
 appVersion: lts
 description: Open source continuous integration server. It supports multiple SCM tools
   including CVS, Subversion and Git. It can execute Apache Ant and Apache Maven-based

stable/jenkins/README.md

@@ -133,7 +133,7 @@ The following tables list the configurable parameters of the Jenkins chart and t
 | `master.JCasC.enabled`            | Wheter Jenkins Configuration as Code is enabled or not | `false`                 |
 | `master.JCasC.defaultConfig`      | Enables default Jenkins configuration via configuration as code plugin | `false` |
 | `master.JCasC.configScripts`      | List of Jenkins Config as Code scripts | `{}`                                    |
-| `master.enableXmlConfig`          | enables configuration done via XML files | `false`                               |
+| `master.enableXmlConfig`          | enables configuration done via XML files | `true`                               |
 | `master.sidecars.configAutoReload` | Jenkins Config as Code auto-reload settings |                                   |
 | `master.sidecars.configAutoReload.enabled` | Jenkins Config as Code auto-reload settings (Attention: rbac needs to be enabled otherwise the sidecar can't read the config map) | `false`                                                      |
 | `master.sidecars.configAutoReload.image` | Image which triggers the reload | `kiwigrid/k8s-sidecar:0.1.20`           |