Merge pull request #374 from josephfh/patch-1

Add missing sendTo in imports, sort imports alphabetically

Author: davidkpiano

docs/callback-actors.mdx

@@ -19,7 +19,7 @@ Callback actors are actors whose logic is represented by a function that can "ca
 You can define callback actor logic using the `fromCallback(...)` actor logic creator, which takes a callback function and returns actor logic that can be used to create callback actors.
 
 ```ts
-import { fromCallback, createActor, createMachine } from 'xstate';
+import { createActor, createMachine, fromCallback, sendTo } from 'xstate';
 
 const resizeLogic = fromCallback(({ sendBack, receive }) => {
   const resizeHandler = (event) => {