Fix broken url for testing instructions.

[RafayGhafoor]

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I've completed each of the following or determined they are not applicable:

• Made a plan to communicate any major developer interface changes (or N/A)

[openedx-webhooks]

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[RafayGhafoor]

@robrap, Please review.

[robrap]

Thank you!

[RafayGhafoor]

@robrap, I don't have the option to merge this PR, can you please do it. Thank you.

[openedx-webhooks]

@RafayGhafoor 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.

[robrap]

Thanks again @RafayGhafoor. I just needed to wait for tests to complete. Note that I squashed using the github UI, but otherwise that would be something you might need to do on other PRs.

[RafayGhafoor]

yes, I understand @robrap. I also made this PR from the UI and it wasn't allowing me to squash since I am not a maintainer I guess.

[robrap]

I think you can only "Squash and Merge" through the UI. So otherwise, you'd need to get your fork locally and squash and push the changes back up.