Patrick C. F. Ernzer

Fixes Foreman Support #22332 - document multiple pxdns

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* [x] I am familiar with the [contributing](https://github.com/theforeman/foreman-documentation/blob/master/CONTRIBUTING.md) guidelines. Please cherry-pick my commits into: * [x] Foreman 3.5/Katello 4.7 (planned Satellite 6.13) * [x] Foreman 3.4/Katello 4.6 (EL8 only) *...

Thank you for creating node-hp-scan-to. so far (a couple hours) it works fine with my HP PageWide 377dw MFP - this trivial PR adds that model to the _reported to...

**Is your feature request related to a problem? Please describe.** Can you please add the `docker exec -it […]` invocation needed to clear-registrations to the main README.md? **Describe the solution...