Problem:
- The doc says the default `g:lua_subversion` is 2, but in fact it is 3
(see `runtime/syntax/lua.vim`)
- `includeexpr` doesn't work with module in `init.lua`
Solution:
- Update documentation
- Assign value to option `&include`
- Add function `LuaInclude` and assign it to `l:&includeexpr`
closes: #16655
Co-authored-by: dkearns <dougkearns@gmail.com>
Signed-off-by: brianhuster <phambinhanctb2004@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>