docs: Go bindings release at the same time as the C library

docs: Go bindings release at the same time as the C library

The actual versioning policy[1] is a bit more nuanced, and in
particular there are scenarios in which the monthly release
is intentionally skipped, but overall it's not inaccurate to
claim that the release cadence of the Go bindings follows the
one of the C library.

[1] https://gitlab.com/libvirt/libvirt-go-module/-/blob/master/VERSIONING.rst

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>