[Hotfix] Typo in shiro_authentication.md (#4447)
[Hotfix] Typo in shiro_authentication.md (#4447)

Remove one `ldapRealm.contextFactory.authenticationMechanism`
apache/zeppelin,apache/zeppelin,apache/zeppelin,apache/zeppelin,jongyoul/zeppelin,apache/zeppelin,jongyoul/zeppelin,jongyoul/zeppelin,apache/zeppelin,jongyoul/zeppelin,jongyoul/zeppelin,jongyoul/zeppelin,jongyoul/zeppelin,apache/zeppelin