Update logging documentation

[cdrage]

https://openshiftdo.org/logging/

The current documentation is incorrect for erroring. We do not use glog for erroring, we should provide examples that functions must provide err return as errors are handled more upstream (within cmd/ files)

[surajnarwade]

cc @anmolbabu

ref link:https://github.com/redhat-developer/odo/blob/master/docs/logging.md

[kadel]

done
/close

[openshift-ci-robot]

@kadel: Closing this issue.

In response to this:

done
/close

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