Fix minior issue in the documentation related to port customization (#7436)

Author: kossidts

.changeset/five-ghosts-sit.md

@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Fix an issue related to the documentation. Destructure the argument of the function to customize the Astro dev server based on the command run.

packages/astro/src/@types/astro.ts

@@ -859,7 +859,7 @@ export interface AstroUserConfig {
 	 * ```js
 	 * {
 	 *   // Example: Use the function syntax to customize based on command
-	 *   server: (command) => ({ port: command === 'dev' ? 3000 : 4000 })
+	 *   server: ({ command }) => ({ port: command === 'dev' ? 3000 : 4000 })
 	 * }
 	 * ```
 	 */