Docs regarding proxy-cpu-limits seem misleading

[Fantaztig]

Hi!

The docs regarding the config.linkerd.io/proxy-cpu-limit annotation seem a bit misleading to me.
https://github.com/linkerd/website/blob/main/linkerd.io/content/2.12/tasks/configuring-proxy-concurrency.md

There it is explicitly stated that:

Unlike Kubernetes CPU limits and requests, which can be expressed in milliCPUs, the proxy-cpu-limit annotation should be expressed in whole numbers of CPU cores. Fractional values will be rounded up to the nearest whole number.

I think the last sentence can be removed or rephrased, as specifying e.g. 0.5 as the limit translates perfectly fine into a cpu.limit of "500m" on the containers.
However, I'm not sure if this is intended and documented wrong, if I misunderstood the docs or if it is a bug 😉

[wmorgan]

@kflynn @hawkw any thoughts?