CH7: Fix start position scatter #13
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Existing code's
plt.scatterwas using z[0] as the size of the marker, hence the red dot is at [0,1] with size 20. Just switchingplttoaxhere makes it use 3d projection.Additionally added the legend, describing that it's the start position.
Before (current code in repo, printed book does not have the scatter point):

After:
