Fix typo in advanced-setups.md

[jaronheard]

Just a quick typo fix in the documentation.

Rad project! We're using it over at https://github.com/hackoregon/civic 🤩

If you're open to contributions, totally can hop in with more documentation improvements as we come across them.

[coveralls]

Pull Request Test Coverage Report for Build 50

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 48:	0.0%
Covered Lines:	155
Relevant Lines:	155

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💛 - Coveralls

[kinetifex]

Thank you!