Fixed coefficients in qubit kata explanation. #2225
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Indeed, atan2(y, x) is present in many languages. We also have ArcTan2(y, x) in Q#, and it takes y as the first argument as expected. The text describes an example of a phase of a complex number$\frac{1 - i}{2}$ . Here x=1/2 and y=-1/2. Previous text had these coefficients switched. Now it is fixed.
Also changed wording from "the phase of |0>" to "the phase of |0> amplitude", which seems to be a better wording as the paragraph talks about phases of complex numbers.