feat: add device-s7 documentation

[jiekechoo]

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

PR Checklist

Please check if your PR fulfills the following requirements:

• Changes have been rendered and validated locally using mkdocs-material (see edgex-docs README)

[lenny-goodell]

Please include adding Device S7 to the Device tab on this page
https://docs.edgexfoundry.org/3.1/general/ServicePorts/

[jiekechoo]

Please include adding Device S7 to the Device tab on this page https://docs.edgexfoundry.org/3.1/general/ServicePorts/

@lenny-intel Should I create a PR to the napa branch?

[cloudxxx8]

we added the device ports for both napa and main
#1341
#1342

Yes, @jiekechoo , once this PR merged, please open another PR against naps, and we plan to release device-s7 for v3.1 later this month

[jiekechoo]

The PR #1346 for branch Napa has created.