[Docs] Update flashing information to include :flash target (#6999)

[Docs] Update flashing information to include :flash target (#6999)

* Update Newbs Flashing guide

For the newbs that want to start flashing

* Update flashing docs

* Misc flashing

* Attempt at flashing in french

Lets hope I didn't butcher this too badly with machine transations

* Update docs/feature_userspace.md

* Apply language suggestions from code review

* Apply suggestions from code review

* Apply additional fr lang suggestions from code review

* Apply suggestions from code review

Co-Authored-By: fauxpark <fauxpark@gmail.com>
Co-Authored-By: Noan Mousy <4sstylz@protonmail.ch>
Co-Authored-By: Xavier Hahn <xavier.hahn@gmail.com>
Co-Authored-By: Vincent LE GOFF <vince.legoff@gmail.com>