Style edits to desktop app authentication code comments & error messages

[libutcher]

This MR includes minor style edits to the desktop app authentication code comments and error messages, including:

• Clarifies in example code comment that you need to set the account name to match the name at the top left sidebar of the app.
• Clarifies in error message the exact setting you need to make sure is enabled and how to find it.

[github-actions]

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[moward98]

Looks good to me!

[libutcher]

Thanks @moward98! I'll get this merged once I've fixed the signing issue (waiting for a new PAT to be approved). Then I'll tag you in to review the same changes in JS & Go.