Update README.md

[debolek]

This PR fixes #

Checklist

• [x] I have signed the CLA
• [x] I have updated/added any relevant documentation

Description

What's the goal of this PR? Goal is to add a full stop at the end of the sentences in the README.md and some mino correction about one of the sentence

What changes did you make? Adding full stop at "Audit, enforce, and build policies for Kubernetes resources, including over 20 built-in checks for best practices."

"Right-size your Kubernetes Deployments by comparing your memory and CPU settings against actual usage." "Simplify the management of RBAC in your Kubernetes clusters."

What alternative solution should we consider, if any? No alternate solutions should be cosidered again since i have added the full stop after the sentences

[CLAassistant]

All committers have signed the CLA.