s390x CPU features not documented in 'quick start'

What happened:

Opened https://github.com/openshift/node-feature-discovery/blob/master/docs/get-started/features.md

What you expected to happen:

Expect to see CPU feature documentation for s390x architecture

How to reproduce it (as minimally and precisely as possible):

Open https://github.com/openshift/node-feature-discovery/blob/master/docs/get-started/features.md

Anything else we need to know?:

The s390x CPU features are defined in https://github.com/openshift/node-feature-discovery/blob/master/source/internal/cpuidutils/cpuid_s390x.go

Environment:

• Kubernetes version (use kubectl version): browser
• Cloud provider or hardware configuration: Z15 KVM Cluster
• OS (e.g: cat /etc/os-release): RHEL 8.3
• Kernel (e.g. uname -a): N/A
• Install tools: N/A
• Network plugin and version (if this is a network-related bug): N/A
• Others:

Start with docs/get-started/features.md and compare its CPU feature documentation with source/internal/cpuidutils/cpuid_s390x.go. Document the s390x CPU features defined by the source in the quick-start features guide, then verify that the guide covers the expected Z15 KVM case.