fix: Change quotes for rpm-ostree installation documentation

[manoelhc]

The current documentation leads to create a .repo file with the content:

[copr:copr.fedorainfracloud.org:pgdev:ghostty]
name=Copr repo for Ghostty owned by pgdev
baseurl=https://download.copr.fedorainfracloud.org/results/pgdev/ghostty/fedora--/
type=rpm-md
skip_if_unavailable=True
gpgcheck=1
gpgkey=https://download.copr.fedorainfracloud.org/results/pgdev/ghostty/pubkey.gpg
repo_gpgcheck=0
enabled=1
enabled_metadata=1' | sudo tee /etc/yum.repos.d/_copr:copr.fedorainfracloud.org:pgdev:ghostty.repo > /dev/null

Note that the correct baseurl must be

baseurl=https://download.copr.fedorainfracloud.org/results/pgdev/ghostty/fedora-$releasever-$basearch/

The double quotes evaluate the $releasever and $basearch values which is normally empty. This variables are used and evaluated by the rpm-ostree system and must be present as a template URL.

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[Comprehensive-Wall28]

This change now creates the file correctly on Fedora Silverblue