Fix the wrong describe of device registry in protocol.md

[hurricane1988]

What type of PR is this?

Add one of the following kinds:
/kind bug

What this PR does / why we need it:

Fix the wrong describe of device registry in protocol.md

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Fix the wrong describe of device registry docs/develop/protocol.md

Does this PR introduce a user-facing change?:
YES

[hami-robott]

Welcome @hurricane1988! It looks like this is your first PR to Project-HAMi/HAMi 🎉

[hami-robott]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: hurricane1988
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[lengrongfu]

thanks you fix, look good to me. but you need solve dco.

/LGTM

[lengrongfu]

@hurricane1988 Please sign dco.

[hami-robott]

Thanks for your pull request. Before we can look at it, you'll need to add a 'DCO signoff' to your commits.

📝 Please follow instructions in the contributing guide to update your commits with the DCO

Full details of the Developer Certificate of Origin can be found at developercertificate.org.

The list of commits missing DCO signoff:

• 8cc02e8 Add the link to other markdown document of design.md, that much more easy to redirect

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