Remove camlp4 reference from the manual (#457)
Remove camlp4 reference from the manual (#457)

Fixes #449.
rneswold/lwt,c-cube/lwt,c-cube/lwt,rneswold/lwt,rneswold/lwt,ocsigen/lwt,ocsigen/lwt,ocsigen/lwt,c-cube/lwt