Bug#1107956: release-notes: Document CET hardening for amd64 (as companion to PAC/BTI on arm64)

Hi Guillem,

On 2025-06-17 11:48, Guillem Jover wrote:
> There was a recent addition about PAC/BTI support for arm64. I think
> it would make sense to also mention the Control-flow Enforcement
> Technology (CET) support for amd64, that got added at the same time,
> for the same dpkg-buildflags "branch" feature, which is also enabled
> by default and ends up adding the «-fcf-protection» flag.
>
> I'm not sure whether it would be best to reword the existing
> "2.2.2. PAC/BTI support on arm64" section to cover both, or to add a
> new section. Let me know what you think, and I could try to propose a
> patch perhaps.

I think it makes sense to reword the existing one, thanks for pointing
this out!