docs(useBattery): fix misleading fetched field description

Author: samithahansaka

src/useBattery/index.ts

@@ -27,7 +27,7 @@ export type UseBatteryState = BatteryState & {
 	 */
 	isSupported: boolean;
 	/**
-	 * Whether the battery state is currently being fetched.
+	 * Whether the battery state has been fetched.
 	 */
 	fetched: boolean;
 };