Add missing quotes to curl command

[jgardner04]

Description

Updated documentation to correct the error in step 4.

Issue reference

We strive to have all PRs being opened based on an issue, where the problem or feature have been discussed prior to implementation.

closes #480

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• [ x ] The quickstart code compiles correctly - no code was changed
• [ x ] You've tested new builds of the quickstart if you changed quickstart code - documentation only change
• [ x ] You've updated the quickstart's README if necessary

[msfussell]

All these changes look good to me, including the updates to the formatting. The curl command is definately an issue in Powershell. Can you check that this curl command still works with a Linux bash terminal, so that there is a consistency (it should)

[jgardner04]

@msfussell I have tested on Ubuntu (WSL2) and confirmed that they work.