nixos/release-notes: add avx cpu requirement for mongodb_5.0 and newe…

…r with avxSupport noted

https://www.mongodb.com/docs/v5.0/administration/production-notes/#platform-support-notes

nixos/doc/manual/release-notes/rl-2405.section.md

@@ -269,7 +269,7 @@ The pre-existing [services.ankisyncd](#opt-services.ankisyncd.enable) has been m
 
 - `mongodb-4_4` has been removed as it has reached end of life. Consequently, `unifi7` and `unifi8` now use MongoDB 5.0 by default.
 
-- `mongodb-5_0` and newer requires a cpu with the avx instruction set to run.
+- `mongodb-5_0` and newer requires a cpu with the avx instruction set to run. A `avxSupport` override has been added but this is not supported upstream.
 
 - `nitter` requires a `guest_accounts.jsonl` to be provided as a path or loaded into the default location at `/var/lib/nitter/guest_accounts.jsonl`. See [Guest Account Branch Deployment](https://github.com/zedeus/nitter/wiki/Guest-Account-Branch-Deployment) for details.