fix: type annotations for lsp callback

Author: saecki

lua/crates/lsp.lua

@@ -40,7 +40,7 @@ function M.server(opts)
 
         ---@param method string
         ---@param params any
-        ---@param callback fun(method: string?, params: any)
+        ---@param callback fun(error: any?, data: any?)
         ---@param notify_reply_callback? fun(request_id: integer)
         ---@return boolean
         ---@return integer