Update README.md

[julienkosinski]

Fix typo. Kubectl won't like HTML...

What this PR does:

Which issue(s) this PR fixes:
Fixes #

Checklist

• Changes manually tested
• Automated Tests added/updated
• Documentation added/updated
• CHANGELOG.md updated (not required for documentation PRs)
• CLA Signed: DataStax CLA

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[Miles-Garnsey]

I can confirm that the existing address https://github.com/k8ssandra/cass-operator/blob/master/config/samples/example-cassdc-three-nodes-single-rack.yaml does not work due to returning html.

However, the new address https://raw.github.com/k8ssandra/cass-operator/blob/master/config/samples/example-cassdc-three-nodes-single-rack.yaml does not exist either. It should be https://raw.githubusercontent.com/k8ssandra/cass-operator/master/config/samples/example-cassdc-three-nodes-single-rack.yaml

[julienkosinski]

Oops... Indeed, thank you for the review... Sorry...

[julienkosinski]

I'll recreate the PR, it's simplier for me.