Removed references to hazelcast.yaml - standardise on hazelcast-enterprise.yaml

[pmcgleenon]

Now that operator is enterprise only, we should only reference hazelcast-enterprise.yaml as the file containing the Hazelcast Custom Resource Definitions. Steps 2.2 & 2.3 already reference hazelcast-enterprise.yaml for creating the Hazelcast cluster.

As shown in https://github.com/hazelcast/hazelcast-platform-operator-docs/issues/175 previously Step 2 contained two tabs (Open Source) and (Enterprise) with the Open Source steps using hazelcast.yaml and Enterprise using hazelcast-enterprise.yaml. The Open Source tab has been removed so we can remove all references to hazelcast.yaml

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