add some jsdoc

src/shared/utils/once.ts

@@ -4,6 +4,11 @@
  * Copyright (c) 2023 Vendicated and Vencord contributors
  */
 
+/**
+ * Wraps the given function so that it can only be called once
+ * @param fn Function to wrap
+ * @returns New function that can only be called once
+ */
 export function once<T extends Function>(fn: T): T {
     let called = false;
     return function (this: any, ...args: any[]) {