old url link for knative-operator cli plugin

[sp-yduck]

Expected Behavior

link to latest release : https://github.com/knative-extensions/kn-plugin-operator/releases/latest or so

Actual Behavior

link to specific (and old) version : https://github.com/knative-extensions/kn-plugin-operator/releases/tag/knative-v1.7.1

Steps to Reproduce the Problem

1. access to https://knative.dev/docs/client/install-kn/#install-the-knative-operator-cli-plugin
2. click 'release page'
3. you will see v1.7.1 release page

Additional Info

Additional context
Add any other context about the problem here.

Install information:

• Platform (GKE, IKS, AKS, etc.): n/a
• Knative Version: n/a