Title: Configure Memcached Connectors

Describe the issue:
Subsystem listed in code example appears to be wrong -
<subsystem xmlns="urn:jboss:domain:datagrid:1.0">

Suggestions for improvement:
The standalone.xml file in the 6.1 distribution shows the subsystem as -
<subsystem xmlns="urn:infinispan:server:endpoint:5.2">
    <memcached-connector socket-binding="memcached" cache-container="local"/>
</subsystem>

Additional information:
The associated schema document in the docs directory confirms the setting and no datagrid option exists, as I would expect. A quick perusal of the attributes shown in the example appears to indicate they are still good - but I only did a very quick perusal.

My guess is it applies to version 6.0 as well, but not sure about 6.2