WIP: Add a manual using odoc and .mld files

[NathanReb]

No description provided.

[christinerose]

I've added some minor line editing, as well as grammar and syntax suggestions. Please let me know if you're looking for a different type of feedback as well.

[christinerose]

Suggested change

	MDX is a tool to help developpers and authors keep their documentation
	MDX is a tool to help developers and authors keep their documentation

[christinerose]

Suggested change

	It is for example used to verify all of
	For example, you can use MDX to verify all

[christinerose]

Suggested change

	MDX is released on opam. You can install it in your switch by running:
	MDX is released on Opam, so you can install it in your switch by running:

[christinerose]

Suggested change

	You can use MDX with your Markdown or [.mli] documentation, where it will ensure
	You can use MDX with your Markdown or [.mli] documentation, which ensures

[christinerose]

Suggested change

	the correctness of code respectively written in multi-line code blocks and
	correct code written in multiline code blocks and

[christinerose]

Suggested change

	This label allows you to assign an environment to an OCaml block. That means
	you benefit from whole the code that has been previously evaluated in that
	environment, be it from other code blocks or {{!page-preludes}preludes}.
	This label allows you to assign an environment to an OCaml block. That means
	you benefit from all the previously evaluated code in that
	environment, be it from other code blocks or {{!page-preludes}preludes}.

[christinerose]

Suggested change

	The environement label expects a single string value which corresponds to the
	name of the environment to use.
	The environment label expects a single string value that corresponds to the current environment's name.

[christinerose]

Suggested change

	When absent, the block will be evaluated in the default environment, e.g.
	the environment shared by all blocks without an [env] label.
	When absent, the block will be evaluated in the default environment, e.g.,
	the environment shared by all blocks without an [env] label.

[christinerose]

Suggested change

	Preludes are fragments of code that can be evaluated ahead of running the
	code in OCaml and OCaml toplevel MDX blocks. They can be used to globally
	open modules, register toplevel printers, set some globals like
	[Printexc.record_backtrace], you name it!
	Preludes are fragments of code that can be evaluated ahead of running the
	code in OCaml and OCaml toplevel MDX blocks. They can globally
	open modules, register toplevel printers, set some globals like
	[Printexc.record_backtrace], and more!

[christinerose]

Suggested change

	They are especially useful if you want to hide or share this kind of setup
	phase, e.g. if you are writing polished documentation you want to publish
	or you are using MDX to add tests in your mli files directly.
	They are especially useful if you want to hide or share this kind of setup
	phase, e.g., you want to publish polished documentation
	or you are using MDX to add tests directly in your [mli] files.