script/packagecloud: say "Rocky Linux"

The distro name is Rocky Linux, so don't omit the word "Linux". Also,
fix the version number for RHEL while we're at it.

Author: bk2204

script/packagecloud.rb

@@ -123,7 +123,7 @@ def distro_names_for(filename)
   when /centos\/6/  then ["RPM RHEL 6/CentOS 6", "el/6"]
   when /centos\/7/  then ["RPM RHEL 7/CentOS 7", "el/7"]
   when /centos\/8/  then ["RPM RHEL 8/CentOS 8", "el/8"]
-  when /rocky\/9/  then ["RPM RHEL 8/Rocky 9", "el/9"]
+  when /rocky\/9/  then ["RPM RHEL 9/Rocky Linux 9", "el/9"]
   end
 
   next unless os