Add information on enabling the Ruby LSP using builtin vim.lsp instea…

[rezhaTanuharja]

Background

With the release of Neovim 0.11, more and more users move away from the nvim-lspconfig plugin in favor of the built-in method of enabling LSP. This method can be quite confusing for new users:

• where to put the LSP config table within my nvim config?
• what should the LSP config table contain?

Summary

Add information on how to enable the Ruby LSP using the built-in method

• provide a config example of enabling the LSP that should work out of the box if users have ruby-lsp installed
• align the example with the example in the nvim-lspconfig section so users can compare the two ways

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[rezhaTanuharja]

I have signed the CLA!

[vinistock]

Thanks for contributing to the documentation! I just have a minor comment