Update polar-shapes.md

docs/POLAR-SHAPES/polar-shapes.md

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 # Polar Shapes - WIP
 
-The shape code can be found in the shapes.js file. The pickShape function adds a new Shape and then a switch statement is used to select the specific shape choosen by the user.
+The shape code can be found in the shapes.js file. The [ShapeUI class](./code/L-system-playground/shape_ui.js) adds a new Shape and then uses a switch statement to select the specific shape choosen by the user.
 
-If you would like to learn more about rendering polar coordinates and rendering polaring shapes, I highly recommend reading Daniel Shiffman's [The Nature of Code](https://natureofcode.com/) book or watching some  of Daniel Shiffman's tutorial videos.  You can find an app [here](https://kfahn22.github.io/shape_playground/) for experimenting with the shape parameters.
+If you would like to learn more about polar coordinates and rendering polaring shapes, I highly recommend reading Daniel Shiffman's [The Nature of Code](https://natureofcode.com/) book or watching some  of Daniel Shiffman's tutorial videos.  You can find an app [here](https://kfahn22.github.io/shape_playground/) for experimenting with the shape parameters.
 
 [Polar Coordinates - The Nature of Code](https://www.youtube.com/watch?v=O5wjXoFrau4k)