(doc) add more info about multiple files

[heathhenley]

Attempting to address #1856 as I learn Ocaml - is something like this example reasonable to add to clear up how to add more files / modules in a library?

Other things:

• if the module has the same name as the library as with hello in the example, is this some type of special situation?
• I followed the linked thread (https://discuss.ocaml.org/t/using-modules-15-characters-long-now/) for how add expose modules from other files within the module that shares a name with the library, but in terms of the interface file, it was a guess. What is the correct what to expose those in the interface file?

Sorry if this is way off I don't have really any experience with OCaml yet.

[cuihtlauac]

Thanks @heathhenley.

I'm sorry I forgot to link to the issue number in my own fix to #1856. It is in PR #1923. You couldn't see I was working on that too.

However, your PR addresses the issue in a slightly different manner, it is possible to combine them. Can you rebase this PR after #1923 gets merged?

[heathhenley]

Oops, yes no problem I'll rebase on your update after you merge and see if mine still add anything useful.

[cuihtlauac]

We've merged #1923. You can rebase. This will allow shortening your patch since module reexports are no longer needed.

My file world.ml probably needs to be renamed en.ml

[heathhenley]

@cuihtlauac, I've just rebased and reconciled with your updates. Let me know what you think!

[cuihtlauac]

Reviewed to line 213, more to come

[heathhenley]

Applied / made the requested changes so far, let me know what else you need. 👍

[cuihtlauac]

This looks good to me. @sabine, @christinerose do you want to have a look?