Typo in documentation tutorial

[Sidisi33]

There seems to be a small typo in the tutorial documentation on the GitHub.io page, specifically in the "Add Scales and Axes" section (https://microsoft.github.io/chart-parts/documentation/tutorial#add-scales-and-axes). It says "Not let's define the skeleton of our chart and define some scales and axes," I believe it should be "Now" instead of "Not."