Explain mutexes

Author: andyw8

lib/ruby_lsp/ruby_lsp_rails/addon.rb

@@ -34,7 +34,7 @@ def initialize
 
         Thread.new do
           @addon_mutex.synchronize do
-            # We need to ensure the Rails client is fully loaded before we activate the addon
+            # We need to ensure the Rails client is fully loaded before we activate the server addons
             @client_mutex.synchronize { @rails_runner_client = RunnerClient.create_client }
           end
         end