Rework the only .doc file into .md

[lfmundim]

Fixes #6095

Context

As stated on the issue, there is a lone .doc file marked as confidential. As per comment from @marcpopMSFT there was no problem on removing the notice and leaving as is. Converted it to .md to be readable on repo and standardized

Changes Made

• rewrote .doc file into .md
• removed confidential notice

Testing

None required. Documentation changes

Notes

None

[dnfadmin]

All CLA requirements met.

[dnfadmin]

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[rainersigwald]

As stated on the issue, there is a lone .doc file marked as confidential.

I think the ship has sailed on that one! 😂

Thanks!