Changelog: Add info about admin email user link changes.

CHANGELOG.md

@@ -32,6 +32,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Minimum lifetime for ephmeral activities changed to 10 minutes and made configurable (`:min_lifetime` option).
 - Introduced optional dependencies on `ffmpeg`, `ImageMagick`, `exiftool` software packages. Please refer to `docs/installation/optional/media_graphics_packages.md`.
 - Polls now always return a `voters_count`, even if they are single-choice
+- Admin Emails: The ap id is used as the user link in emails now.
 
 <details>
   <summary>API Changes</summary>