doc: Adapt GLib documentation path to GLib 2.80.1 #291

Job	Run time
Arch Linux	1m 58s
OpenMandriva Cooker	3m 31s
Get Fedora Releases	3s
openSUSE Tumbleweed	2m 4s
Mageia 8	2m 4s
Unit Tests (Devel Fedora) (41)	8s
Unit Tests (Stable Fedora) (38)	3m 21s
Installed RPM Tests (Devel Fedora) (x86_64, 41)	18s
Installed RPM Tests (Stable Fedora) (x86_64, 38)	3m 32s
Unit Tests (Stable Fedora) (39)	3m 25s
Installed RPM Tests (Stable Fedora) (x86_64, 39)	3m 32s
Installed RPM Tests (Stable Fedora) (x86_64, 40)	2m 34s
Unit Tests (Stable Fedora) (40)	2m 54s
	29m 24s

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