Add Neovim LSP client configuration examples.

**Your Godot version:**
v4.2.1.stable.official

**Issue description:**
Simulating an `stdio` connection against the LSP server through a piped TCP connection might cause issues that seem server-sided such as `textDocument/hover` not working correctly as reported on https://github.com/godotengine/godot/issues/87192 when in reality the issue is client-sided.

This issue is specific to Neovim -- it would be nice to have working examples of LSP client configurations for NeoVim in the documentation.

**URL to the documentation page (if already existing):**
https://docs.godotengine.org/en/stable/tutorials/editor/external_editor.html