docs: update quickstart.md

[junczhu]

A spacing fix

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[zr-msft]

@junczhu thank you for the suggestion!

Before we consider merging:

• This seems like a spacing fix. Does the current code block lead to any issues/errors when going through the doc?
• Have you tested the whole doc with you proposed changes to ensure everything still works?

[junczhu]

@junczhu thank you for the suggestion!

Before we consider merging:

• This seems like a spacing fix. Does the current code block lead to any issues/errors when going through the doc?
• Have you tested the whole doc with you proposed changes to ensure everything still works?

@zr-msft there is no issue coming with either the current code block or the proposed changes