[DOC beta] Update README.md for language fix

Update README.md to improve language parallelism in steps in "How to Run Unit Tests"

BEFORE: "Then visit http://localhost:4200/. This will run all tests."
AFTER: "To run all tests, visit http://localhost:4200/."
Merge pull request #9934 from alextsg/patch-1

[DOC beta] Update README.md for language