Updating Lua API Docs

1. Clone the neovim repo somewhere on your system
2. Run ./scripts/gen_vimdoc.py
3. Copy neovim/runtime/doc/*.mpack files to the neodev.nvim data directory
4. Open the file neodev.nvim/lua/build/api.lua in Neovim
5. Execute :luafile %
6. You'll see a lot of annotations that might be changed due to your local system setup, so you can ignore those
7. Check if the changes you intended are present
8. Create a PR with your code changes, and without the new EmmyLua annotations