Update namespaces.md to remove monospace formatting in Note block

Note block advising against the use of `kube-` prefixes
was formatted as a mono space code block which stopped
word wrapping.

Author: NommyNomm

content/en/docs/concepts/overview/working-with-objects/namespaces.md

@@ -61,7 +61,7 @@ Creation and deletion of namespaces are described in the
 [Admin Guide documentation for namespaces](/docs/tasks/administer-cluster/namespaces).
 
 {{< note >}}
-    Avoid creating namespaces with the prefix `kube-`, since it is reserved for Kubernetes system namespaces.
+Avoid creating namespaces with the prefix `kube-`, since it is reserved for Kubernetes system namespaces.
 {{< /note >}}
 
 ### Viewing namespaces