fixing using docker link in README.md

[swardlincoln]

Description of Change

Fixing the link in README to Using docker

Related Issue

Motivation and Context

Just document maintenance.

Checklist

• [ ] ~Ran npm run lint and updated code style accordingly~
• [ ] ~npm run test passes~
• [ ] ~PR has a description and all contributors/stakeholder are noted/cc'ed~
• [ ] ~tests are updated and/or added to cover new code~
• [ ] ~relevant documentation is changed and/or added~ Did run any of the code tests because the fix was for documentation only.