docs(typo): fix typo in README.md

[lumirlumir]

Description

Hello, I fixed typo in README.md

I think using or is more correct rather than using ,(comma). Every other descriptions are written with or not a ,(comma).

ex.)

• a, b or c is correct.
• a or b is correct.
• a, b is NOT correct.

Related issue: nothing

Check list

• [x] Related issue / work item is attached
• [x] Tests are written (if applicable)
• [x] Documentation is updated (if applicable)
• [x] Changes are tested and related VM images are successfully generated