Fix coreos.com broken link for Operator pattern

[akshayhiremath]

Operator Pattern link was pointing to https://coreos.com/operator. This link was redirecting to the openshift.com homepage.
Provided new link on openshift.com pointing to Operator Pattern documentation.

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[akshayhiremath]

Hi, I have signed the CLA. Please review and accept my PR. Thanks, *Akshay*

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[akshayhiremath]

/assign @annajung

[tengqm]

Thanks.
/lgtm
/approve

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LGTM label has been added.

Git tree hash: b458fc55699d1caafc927ffb3cb1b7a3adf1dd8d

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