docs: remove duplicated arrows (#23436)

docs/2.guide/2.directory-structure/1.server.md

@@ -185,29 +185,29 @@ You can also use `index.[method].ts` inside a directory for structuring your cod
 **Example:**
 
 ```ts [server/api/foo/index.ts]
-export default defineEventHandler((event) => => {
+export default defineEventHandler((event) => {
   // handle the `api/foo` endpoint
 })
 ```
 
 This is useful to create API namespaces.
 
-**Example:**
+**Examples:**
 
 ```ts [server/api/foo/index.get.ts]
-export default defineEventHandler((event) => => {
+export default defineEventHandler((event) => {
   // handle GET requests for the `api/foo` endpoint
 })
 ```
 
 ```ts [server/api/foo/index.post.ts]
-export default defineEventHandler((event) => => {
+export default defineEventHandler((event) => {
   // handle POST requests for the `api/foo` endpoint
 })
 ```
 
 ```ts [server/api/foo/bar.get.ts]
-export default defineEventHandler((event) => => {
+export default defineEventHandler((event) => {
   // handle GET requests for the `api/foo/bar` endpoint
 })
 ```