doc: Adapt GLib documentation path to GLib 2.80.1 #298

Job	Run time
Arch Linux	1m 57s
Get Fedora Releases	3s
Mageia 8	2m 4s
OpenMandriva Cooker	2m 49s
openSUSE Tumbleweed	1m 59s
Installed RPM Tests (Devel Fedora) (x86_64, 41)	52s
Unit Tests (Stable Fedora) (40)	3m 1s
Installed RPM Tests (Stable Fedora) (x86_64, 40)	2m 29s
Unit Tests (Stable Fedora) (38)	3m 45s
Installed RPM Tests (Stable Fedora) (x86_64, 38)	3m 41s
Unit Tests (Devel Fedora) (41)	40s
Unit Tests (Stable Fedora) (39)	3m 43s
Installed RPM Tests (Stable Fedora) (x86_64, 39)	3m 23s
	30m 26s

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