docs: Update Server Side Calls docs

Author: Colonel-Sandvich

docs/content/1.get-started/5.tips/4.server-side-calls.md

@@ -27,11 +27,11 @@ export const router = t.router({
 ```
 
 ```ts [server/api/greeting.ts]
-import { router } from '@/server/trpc/trpc'
+import { appRouter } from '@/server/trpc/routers'
 
-export default eventHandler(async (event) => {
+export default defineEventHandler(async (event) => {
   const { name } = getQuery(event)
-  const caller = router.createCaller({})
+  const caller = appRouter.createCaller({})
 
   const greeting = await caller.greeting({ name })
 
@@ -67,11 +67,11 @@ export const router = t.router({
 ```
 
 ```ts [server/api/post.ts]
-import { router } from '@/server/trpc/trpc'
+import { appRouter } from '@/server/trpc/routers'
 
-export default eventHandler(async (event) => {
+export default defineEventHandler(async (event) => {
   const body = await getBody(event)
-  const caller = router.createCaller({})
+  const caller = appRouter.createCaller({})
 
   const post = await caller.post.add(body.post)