docs: fix `$effect.root` jsdoc formatting (#16411)

packages/svelte/src/ambient.d.ts

@@ -295,13 +295,13 @@ declare namespace $effect {
 	 *   let count = $state(0);
 	 *
 	 *   const cleanup = $effect.root(() => {
-	 *	    $effect(() => {
-	 *				console.log(count);
-	 *			})
+	 *     $effect(() => {
+	 *       console.log(count);
+	 *     })
 	 *
-	 *      return () => {
-	 *        console.log('effect root cleanup');
-	 * 			}
+	 *     return () => {
+	 *       console.log('effect root cleanup');
+	 *     }
 	 *   });
 	 * </script>
 	 *

packages/svelte/types/index.d.ts

@@ -3369,13 +3369,13 @@ declare namespace $effect {
 	 *   let count = $state(0);
 	 *
 	 *   const cleanup = $effect.root(() => {
-	 *	    $effect(() => {
-	 *				console.log(count);
-	 *			})
+	 *     $effect(() => {
+	 *       console.log(count);
+	 *     })
 	 *
-	 *      return () => {
-	 *        console.log('effect root cleanup');
-	 * 			}
+	 *     return () => {
+	 *       console.log('effect root cleanup');
+	 *     }
 	 *   });
 	 * </script>
 	 *