docs: fix license link

[ChristianDarr-personal]

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

PR Checklist

Please check if your PR fulfills the following requirements:

• [x] I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• [x] 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?) N/A
• [x] 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?) N/A

Testing Instructions

Click on the license link in the README and verify it takes you to the license information for the correct branch/repo.

New Dependency Instructions (If applicable)

[codecov-commenter]

Codecov Report

Merging #373 (29f1d5b) into main (0c872bb) will not change coverage. The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main     #373   +/-   ##
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  Coverage   34.09%   34.09%           
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  Files          19       19           
  Lines        1804     1804           
=======================================
  Hits          615      615           
  Misses       1123     1123           
  Partials       66       66           

[vyshali-chitikeshi]

LGTM