docs(react): fix/update docs

[micahjones13]

Brief Description

Our React docs had an incorrect example in the testing section. Also, the link to the test app repo at the bottom of the React docs page in now incorrect since that test repo has been removed in recent versions. The link now points to 7.7, which has the test repo.

JIRA Link

Related Issue

#1114

General Notes

We'll need to do a SB publish for this to go live.

Motivation and Context

User noticed syntax error in code examples.
Test app repo couldn't be easily found.

Issues and Limitations

Types of changes

• Bug fix
• New feature
• Breaking change

Checklist

• This PR adds or removes a Storybook story.
• I have added tests to cover my changes.
• Regressions are passing and/or failures are documented
• Changes have been checked in evergreen browsers

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Latest commit: 370f3ec

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[kiley-mitti]

looks good to me :)