DOC Fixing the URL for React Dev tools

[catharsisjelly]

Description

The URL for the React Dev Tools had a bad URL in it. This PR does the following

• Fixes that URL
• Moves the link to be directly connect with the word Chrome
• Adds a link to the Firefox Dev tools

Issues

• URL for React Dev tools not working #618

Pull request checklist

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[GuySartorelli]

Thanks for this. Minor change below.

[GuySartorelli]

LGTM, thanks again