Update k8s-agent-operator.mdx

[mangulonr]

Updated support info now that we're on GA

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[adutta-newrelic]

Rewrote the sentence from

The Kubernetes APM auto-attach supports Java, .NET, Node.js, Python, Ruby, and PHP agents according to our standard APM agent support policy starting with the following minimum versions:

• Java: 8.12
• .NET: 10.25
• Ruby: 9.10
• Node: 11.9
• Python: 9.10
• PHP: 11.12

To

Kubernetes APM auto-attach supports the following languages and their minimum supported versions according to our standard APM agent support policy:

• Java: 8.12
• .NET: 10.25
• Ruby: 9.10
• Node.js: 11.9
• Python: 9.10
• PHP: 11.12