Audit Testing course for language/grammar

[SheaBelsky]

We'd like to make sure that our Testing course has proper English grammar, spelling, and language throughout the exercise. Content should be readable and understandable to everyone, especially for individuals for whom English may not be their strongest language.

[zhang1pr]

I can work on this.

[SheaBelsky]

@zhang1pr It's yours, thank you so much!