refactor: share language IDs with indentation configuration

src/ruby_config.rb

@@ -262,7 +262,7 @@ module Vamp
       @tab_spaces = tab_spaces!(spaces)
     end
 
-    # @param languages [Hash{String => Integer, nil}] syntax language names to Tab widths
+    # @param languages [Hash{String => Integer, nil}] LSP-style language IDs to Tab widths
     # @return [Hash{String => Integer, nil}]
     def language_tab_spaces=(languages)
       raise TypeError, "language_tab_spaces must be a Hash" unless languages.is_a?(Hash)