[ZEPPELIN-2804] Fix shiro_authentication documentation
[ZEPPELIN-2804] Fix shiro_authentication documentation

The github preview is fine but the html on https://zeppelin.apache.org/docs/0.8.0-SNAPSHOT/security/shiroauthentication.html#ldap is not displaying the code fragment correctly.

### What is this PR for?
Fixes the documentation orientation for shiro LDAPRealm

### What type of PR is it?
[Documentation]

### Todos

### What is the Jira issue?
https://issues.apache.org/jira/browse/ZEPPELIN-2804

### How should this be tested?
Build the documentation and verify that the problem as stated in image is resolved.

### Screenshots (if appropriate)
<img width="856" alt="screen shot 2017-07-21 at 10 08 04 am" src="https://user-images.githubusercontent.com/5103613/28454775-c91fbe1e-6dfc-11e7-9601-6279be44f124.png">

### Questions:
* Does the licenses files need update? N
* Is there breaking changes for older versions? N
* Does this needs documentation? N

Author: Sohaib Iftikhar <sohaib1692@gmail.com>

Closes #2500 from sohaibiftikhar/patch-1 and squashes the following commits:

94e18433 [Sohaib Iftikhar] Fixed documentation for shiro LDAPRealm

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