Mention kfence in debugging training ?

[Tropicao]

We mention plenty of runtime checkers for the kernel in debugging training, with a variety of overhead ranges.
We currently do not mention kfence, which seems to be designed for production, trading a bit of precision in favor of very good performance.

Could be a worthy addition ? However, contrary to KASAN, KFENCE works only on heap

https://docs.kernel.org/dev-tools/kfence.html

@oli-ben @lucaceresoli any opinion on this ? If relevant, the job would be quite straightforward, as the kernel training already mentions it, so we could share some slides.