docs: Add link back to Ruby LSP config documentation (#48613)

Edward Loveall created 

Small thing here, but there's no actual link back to the ruby-lsp docs,
like there is for other languages or ruby LSPs (like solargraph). This
should help users find the correct docs for configuring.

Release Notes:

- N/A

Change summary

docs/src/languages/ruby.md | 2 ++
1 file changed, 2 insertions(+)

Detailed changes

docs/src/languages/ruby.md 🔗 

@@ -162,6 +162,8 @@ You can pass Ruby LSP configuration to `initialization_options`, e.g.
 }
 ```
 
+For full configuration options, see the [Ruby LSP website](https://shopify.github.io/ruby-lsp/editors.html).
+
 LSP `settings` and `initialization_options` can also be project-specific. For example to use [standardrb/standard](https://github.com/standardrb/standard) as a formatter and linter for a particular project, add this to a `.zed/settings.json` inside your project repo:
 
 ```json [settings]