download: minor adjustments

content/pages/en/download.rst

@@ -20,7 +20,8 @@ to be notified of new releases, including upgrade instructions if necessary.
 Debian / Ubuntu
 ---------------
 
-Install our upstream repositories using these steps:
+On Debian unstable and testing, use packages directly from Debian repositories.
+Otherwise install our upstream repositories using these steps:
 
 ::
 
@@ -32,8 +33,8 @@ Install our upstream repositories using these steps:
 For complete matrix of supported releases and architectures, see
 `home:CZ-NIC:knot-resolver-latest`_.
 
-Enterprise Linux 7, 8
----------------------
+Enterprise Linux 7, 8, 9
+------------------------
 
 Use Fedora EPEL.
 
@@ -42,7 +43,7 @@ Use Fedora EPEL.
    yum install -y epel-release
    yum install -y knot-resolver
 
-Package updates are delayed by about 2 weeks after release. To obtain the
+Package updates are delayed by about one week after release. To obtain the
 latest released version early, you can use the epel-testing repository.
 
 ::