Typo fixes in prTester readme file

[AyBims]

Fixes: #454
signed-off-by: Ayomide Adeshina [email protected]

[github-actions]

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[karianna]

LGTM

[zdtsw]

some linter errors still need to fix

[karianna]

@AyBims - A few linter issues to fix as Wen mentions.

[karianna]

@AyBims Are you able to rebase this PR?

[github-actions]

A block has been put on this Pull Request as this repository is temporarily under a code freeze due to an ongoing release cycle.

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[gdams]

/thaw

Pull Request unblocked - code freeze is over.