fixed a code snippet in userdata section

source/adminguide/virtual_machines/user-data.rst

diff --git a/source/adminguide/virtual_machines/user-data.rst b/source/adminguide/virtual_machines/user-data.rst
index 8e75c0b..d863859 100644
--- a/source/adminguide/virtual_machines/user-data.rst
+++ b/source/adminguide/virtual_machines/user-data.rst
@@ -51,7 +51,9 @@
 with userdata parameters.
 
 For example, if userdata content is like below having a custom variable "variable1"
+
    .. code:: bash
+
       ## template: jinja
       #cloud-config
       runcmd: