incubator-kie-kogito-examples doc: fixed the process-knative-quickstart-quarkus README.md with the …

Fixed the process-knative-quickstart-quarkus README.md with the correct name of file (seems to be miscopied from kafka doc).

NOTE: I didn't follow all steps because is just a minor doc issue. If this is really necessary, I'll be more than happy to follow, just let me know. (This is my first contribution to opensource)

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