Runestone Documentation Issue: 6.1 Add Link for Homebrew

[GalinaP7]

What Page were you on
Please copy/paste the URL from your address bar.

Describe the bug
In section 6.1 Prerequisites, under the bash bullet, Homebrew should be hyperlinked.
"Homebrew" should be linked to https://brew.sh/

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What is your username
@pokitkog