GNU Guile 2.1.x
Just install the package. It can be installed alongside the existing guile package. After the installation, info pages can be found in the "Guile 2.2 Reference" section, which should be visible alongside the original info manual.
This is a companion discussion topic for the original entry at https://copr.fedorainfracloud.org/coprs/jsynacek/gnu-guile-2.1.x/