docs: fix incorrect import path in automatic code splitting guide (#4745)

Author: JustinMissmahl

docs/router/framework/react/guide/automatic-code-splitting.md

@@ -9,7 +9,7 @@ To turn this feature on, simply set the `autoCodeSplitting` option to `true` in
 ```ts
 // vite.config.ts
 import { defineConfig } from 'vite'
-import { tanstackRouter } from '@tanstack/react-router/vite'
+import { tanstackRouter } from '@tanstack/router-plugin/vite'
 
 export default defineConfig({
   plugins: [
@@ -87,7 +87,7 @@ For example, to bundle all UI-related components into a single chunk, you could
 ```ts
 // vite.config.ts
 import { defineConfig } from 'vite'
-import { tanstackRouter } from '@tanstack/react-router/vite'
+import { tanstackRouter } from '@tanstack/router-plugin/vite'
 
 export default defineConfig({
   plugins: [
@@ -115,7 +115,7 @@ For complex rulesets, you can use the `splitBehavior` function in your vite conf
 ```ts
 // vite.config.ts
 import { defineConfig } from 'vite'
-import { tanstackRouter } from '@tanstack/react-router/vite'
+import { tanstackRouter } from '@tanstack/router-plugin/vite'
 
 export default defineConfig({
   plugins: [
@@ -179,7 +179,7 @@ The `loader` function is responsible for fetching data needed by the route. By d
 ```ts
 // vite.config.ts
 import { defineConfig } from 'vite'
-import { tanstackRouter } from '@tanstack/react-router/vite'
+import { tanstackRouter } from '@tanstack/router-plugin/vite'
 
 export default defineConfig({
   plugins: [