doc: Adapt GLib documentation path to GLib 2.80.1 #296

Job	Run time
Mageia 8	2m 4s
openSUSE Tumbleweed	2m 43s
OpenMandriva Cooker	3m 30s
Arch Linux	2m 3s
Get Fedora Releases	5s
Installed RPM Tests (Devel Fedora) (x86_64, 41)	24s
Installed RPM Tests (Stable Fedora) (x86_64, 40)	2m 36s
Unit Tests (Stable Fedora) (40)	2m 55s
Unit Tests (Devel Fedora) (41)	17s
Unit Tests (Stable Fedora) (39)	3m 35s
Installed RPM Tests (Stable Fedora) (x86_64, 39)	3m 26s
Unit Tests (Stable Fedora) (38)	3m 30s
Installed RPM Tests (Stable Fedora) (x86_64, 38)	4m 21s
	31m 29s

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