Improve the documentation of profiling with "perf maps"

The documentation lives here: https://github.com/python/cpython/blob/d6cf05b5d00abbfdf9008d646c14c6ef7c83b61a/Doc/howto/perf_profiling.rst

Before #136461, cpython only had support for Linux perf profiling. But with this PR it now supports both Linux and macOS through samply. I updated the documentation to include this, but it's not super great currently because previously it was written with the assumption that it was only supported by Linux perf. So it would be good to restructure this doc in a better way, and add more information related to macOS profiling using samply.

Also samply supports both perf modes so it would be good to clarify when to use them.

cc @pablogsal @hugovk

Commencez par Doc/howto/perf_profiling.rst et examinez les changements de PR #136461 pour comprendre la couverture actuelle de Linux perf et macOS samply. Comparez les modes perf pris en charge par samply et réorganisez le guide afin que la prise en charge des plateformes, la configuration et la sélection du mode soient claires. La tâche est terminée lorsque la documentation explique correctement le profiling sous Linux et macOS, ainsi que le moment où utiliser chaque mode.