chore(github): narrow the self-hosted CORS note in the playback form

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.github/ISSUE_TEMPLATE/playback_problem.yml

@@ -10,7 +10,7 @@ body:
 
               **Quick check first:** the built-in HTML5, Video.js and ArtPlayer players can't decode some codecs, for example HEVC/4K, AC3 or MPEG-2 video.
               - **Desktop app:** such streams usually play with **Embedded MPV** or an external **MPV** or **VLC** (**Settings → Playback → Video player**). Whether the stream plays there tells us a lot, so please mention it below.
-              - **Self-hosted web app:** only the browser players are available, and the browser also blocks streams without CORS headers or `http://` streams on an `https://` page. Trying the same stream in the desktop app or in VLC helps us narrow it down.
+              - **Self-hosted web app:** only the browser players are available. HLS, DASH and MPEG-TS streams may fail when the provider doesn't send CORS headers, and the browser may block `http://` streams on an `https://` page. Trying the same stream in the desktop app or in VLC helps us narrow it down.
     - type: checkboxes
       id: checks
       attributes: