bug#32124: 404 link in manual: SLIB-installation.html

[Brendan Tildesley]

https://www.gnu.org/software/guile/manual/html_node/SLIB-installation.html#SLIB-installation

links to

https://www.gnu.org/software/guile/manual/slib/Installation.html#Installation


which directs to a 404 page.