doc/neovim: better document the wrappers (#373805)

* doc/neovim: better document the wrappers

there is new wrapper interface `wrapNeovimUnstable` in development intended to be
easier to use than the old `wrapNeovim`. It provides new fancy features that we would like to
leverage/advertise
The interface is not definitive yet so we provide a translation layer
to avoid breaking user configurations such that `wrapNeovim` still works.
This explains why we document both at the moment with the goal to remove
the old one once we ciment the interface.

* doc/neovim: explain what buildNeovimPlugin does

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