docs: use updated h3 utils

docs/content/2.guide/2.features/9.server-routes.md

@@ -155,7 +155,7 @@ export default defineEventHandler((event) => {
 
 ```ts
 export default defineEventHandler((event) => {
-  const cookies = useCookies(event)
+  const cookies = parseCookies(event)
   return { cookies }
 })
 ```

docs/content/3.api/1.composables/use-cookie.md

@@ -138,14 +138,14 @@ Specifies a function that returns the cookie's default value. The function can a
 
 ## Handling Cookies in API Routes
 
-You can use `useCookie` and `setCookie` from [`h3`](https://github.com/unjs/h3) package to set cookies in server API routes.
+You can use `getCookie` and `setCookie` from [`h3`](https://github.com/unjs/h3) package to set cookies in server API routes.
 
 **Example:**
 
 ```js
 export default defineEventHandler(event => {
   // Read counter cookie
-  let counter = useCookie(event, 'counter') || 0
+  let counter = getCookie(event, 'counter') || 0
 
   // Increase counter cookie by 1
   setCookie(event, 'counter', ++counter)