docs: Demonstrate disabling `solargraph` when enabling `ruby-lsp` (#12399)

This PR fixes a small issue in the Ruby docs, where we weren't properly
demonstrating that `solargraph` should be disabled when enabling
`ruby-lsp`.

Release Notes:

- N/A
cd77e72479Marshall Bowers committed on 5/28/2024, 10:50:00 PM· committed by GitHubparentbde3056
1 file changedLine totals unavailable