Docs: Avoid telling developers on fedora to update their system

[laine-hallot]

Description

Currently the development instructions tell fedora users to run sudo dnf update before installing the required development packages. Considering the sudo apt-get update instruction in the ubuntu guide I'm assuming the intent with that instruction was to make sure people's package managers have an up to date list of available packages but dnf update doesn't do that, it just updates all packages on the system.

dnf usually takes care of refreshing its cache of package metadata on its own so the fedora instructions should be fine with just sudo dnf install ...

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Type definition update
• Documentation update

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes
• I have updated the documentation accordingly

[JumpLink]

Yes, that's better, thank you.