fix: Move API document files from openapi/v3 to openapi

[cherrycl]

Related to edgexfoundry/edgex-go#4978

If your build fails due to your commit message not passing the build checks, please review the guidelines here: https://github.com/edgexfoundry/device-sdk-go/blob/main/.github/Contributing.md

PR Checklist

Please check if your PR fulfills the following requirements:

• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?)
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
• I have opened a PR for the related docs change (if not, why?)

Testing Instructions

New Dependency Instructions (If applicable)

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 32.69%. Comparing base (791e380) to head (8f827bd).

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1641   +/-   ##
=======================================
  Coverage   32.69%   32.69%           
=======================================
  Files          48       48           
  Lines        4756     4756           
=======================================
  Hits         1555     1555           
  Misses       3063     3063           
  Partials      138      138           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[cloudxxx8]

LGTM