Search entries for module aliases return dead links

[lpw25]

Searching for Throttle in Async at http://ocaml.org or on http://doc.sherlocode.com produces an entry for Async.Throttle with a dead link to the url:

https://ocaml.org/p/async/v0.16.0/doc/Async/Throttle/index.html

it should instead link to:

https://ocaml.org/p/async_kernel/v0.16.0/doc/Async_kernel/Throttle/index.html

because Throttle in Async is just a module alias to Throttle in Async_kernel.