Change function description comments to tsdoc style (#35185)

1. change function comments to the minimal [tsdoc](https://tsdoc.org/)
style. This has the benefit of making editors show the doc string in
tooltips when the function is hovered:

<img width="521" height="110" alt="image"
src="https://github.com/user-attachments/assets/b966f4f1-8239-433a-a456-5bd5c05d69ef"
/>

2. disable eslint `multiline-comment-style` as it conflicts with tsdoc.

---------

Signed-off-by: silverwind <me@silverwind.io>

web_src/js/modules/toast.ts

@@ -42,7 +42,7 @@ type ToastOpts = {
 
 type ToastifyElement = HTMLElement & {_giteaToastifyInstance?: Toast };
 
-// See https://github.com/apvarun/toastify-js#api for options
+/** See https://github.com/apvarun/toastify-js#api for options */
 function showToast(message: string, level: Intent, {gravity, position, duration, useHtmlBody, preventDuplicates = true, ...other}: ToastOpts = {}): Toast {
   const body = useHtmlBody ? message : htmlEscape(message);
   const parent = document.querySelector('.ui.dimmer.active') ?? document.body;