download: formulation nits in `apt` section

knot/knot-resolver#798

content/pages/en/download.rst

@@ -30,7 +30,8 @@ Otherwise install our upstream repositories using these steps:
    apt update
    apt install -y knot-resolver
 
-For complete matrix of supported releases and architectures, see
+After that ``apt`` will keep updating knot-resolver 5.x packages from our repositories.
+For complete matrix of releases and architectures in those repos, see
 `home:CZ-NIC:knot-resolver-latest`_.
 
 Enterprise Linux 7, 8, 9