Fix fig reference. Closes #37

Author: thomasfermi

book/Control/BicycleModel.md

@@ -141,7 +141,7 @@ As we have learned in {numref}`ICR_construction`, we construct the ICR by drawin
 ![](./images/pure_pursuit_simple_geometry.png)
 ```
 
-From the triangle in {numref}`ICR_construction` we find
+From the triangle in {numref}`BicycleModelGeometry` we find
 
 $$ \tan(\delta) = \frac{L}{R}$$
 
@@ -175,4 +175,4 @@ We could have picked any other point between the front and rear wheel as the ref
 
 ```{tip}
 If you found this material difficult, or if you are interested in learning more, I recommend the [great lectures on Vehicle Dynamics and Control by Prof. Georg Schildbach on youtube](https://www.youtube.com/playlist?list=PLW3FM5Kyc2_4PGkumkAHNXzWtgHhaYe1d).
-```
+```