rename variables

Author: BertrandGouny

README.md

@@ -84,7 +84,7 @@ simply mount this directories as a volume to `/var/lib/ldap` and `/etc/ldap/slap
 You can also use data volume containers. Please refer to :
 > [https://docs.docker.com/userguide/dockervolumes/](https://docs.docker.com/userguide/dockervolumes/)
 
-### Using TLS
+### TLS
 
 #### Use autogenerated certificate
 By default TLS is enable, a certificate is created with the container hostname (it can be set by docker run -h option eg: ldap.example.org).
@@ -151,7 +151,7 @@ Search on the second ldap server, and billy should show up !
 If you are looking for a simple solution to administrate your ldap server you can take a look at our phpLDAPadmin docker image :
 > [osixia/phpldapadmin](https://github.com/osixia/docker-phpLDAPadmin)
 
-## Backups
+## Backup
 A simple solution to backup your ldap server, our openldap-backup docker image :
 > [osixia/openldap-backup](https://github.com/osixia/docker-openldap-backup)