primitives.js implementation does not match documentation.

[Scott-Coleman]

From the lesson, "Drawing Multiple Things", in the source file "primitives.js"...

If I understand the documentation for the "createSphereVertices()" function, it does not match the implementation.

Within the function, the optional parameter "opt_startLatitudeInRadians" is missing from calculation of "phi".

I think the line should be:

const phi = latRange * v + opt_startLatitudeInRadians;

...or by some other mechanism "opt_startLatitudeInRadians" needs to be the starting point for calculation of "phi".

By inspection, a similar issue exists for the computation of "theta"

[greggman]

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