Add 'runc' to Fedora uninstall instructions

[riptl]

Description

When switching from Fedora Docker to Docker CE, I also had to uninstall the runc package.
Otherwise, I would get lots of DNF conflicts when trying to install Docker CE.

Related issues or tickets

Reviews

• Technical review
• Editorial review
• Product review

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[docker-robot]

Thanks for the pull request. We'd like to make our product docs better, but haven’t been able to review all the suggestions.
As our docs have also diverged, we do not have the bandwidth to review and rebase old pull requests.

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