Fix set KDC admin credentials section in enable Kerberos doc

The current documentation at 
https://github.com/apache/ambari/blob/branch-2.7/ambari-server/docs/security/kerberos/enabling_kerberos.md#set-the-kdc-administrator-credentials
 indicates an incorrect URL for the API call. 

It should read:

```
http://AMBARI_SERVER:8080/api/v1/clusters/CLUSTER_NAME/credentials/kdc.admin.credential
```

This was cherry-picked from #2144 

## How was this patch tested?

No testing is necessary for a doc-only change.

Please review [Ambari Contributing 
Guide](https://cwiki.apache.org/confluence/display/AMBARI/How+to+Contribute) 
before opening a pull request.

[ Full content available at: https://github.com/apache/ambari/pull/2145 ]
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