Sort out the list of supported operating systems

[osokin]

Describe the bug

The list of the supported operating systems needs to be sorted out, i.e. RHEL / Rocky Linux before Ubuntu.

To reproduce

Steps to reproduce the behavior:

1. Open https://docs.nginx.com/waf/fundamentals/technical-specifications/#supported-operating-systems
2. View output
3. See error

Expected behavior

I expected to see a sorted out list of the supported operating systems.

Your environment

macOS/Chrome

Additional context

No any other context about the problem here.

Sensitive Information

No any sensitive information such as authentication credentials or license keys.