Steps to reproduce:

1. Load https://www.zabbix.com/documentation/current/manual/installation/install_from_packages/rhel_centos
2. Read

   Some agent and proxy packages are available for RHEL 6 and RHEL 5 as well.

3. Click RHEL 6 
4. Look for "proxy"
5. Go back
6. Click RHEL 5
7. Look for "proxy"

Result:
There's no "proxy" on either page
Expected:
The sentence says "Some ... proxy packages" – I expect "Some proxy packages".

Either remove the "proxy" text, or ... preferably, provide the packages