Documentation/Index issues

[Drup]

• Eliom_client_common is in the index, but is 404.
• Eliom_client is not in the index on the server (and should be).
• Eliom_client_value is in neither client nor server index.
• Eliom_config/request_info/state should be further down in the index (they are not that useful). Maybe comet too, since using bus/react is almost always better.