correct a few typos for code review, #36

doc/implementation-notes.md

@@ -11,8 +11,8 @@ Before reading this document, please read:
 
 ### General Considerations
 
-#### Model View Transform
-This sim uses one model view transform to map model coordinates (0, 1) to view coordinates.
+#### Model-View Transform
+This sim uses one model-view transform to map model coordinates (0, 1) to view coordinates.
 
 This transform is applied to both the 2D and 3D water cups and their water levels. The bottom of the cups is mapped to 0, and the top of the cups is mapped to 1. Any number in between is viewed as a percentage of water filled. 
 
@@ -31,13 +31,13 @@ Currently, this sim is a single screen.
 
 See [model.md](https://github.com/phetsims/mean-share-and-balance/blob/master/doc/model.md)
 
-As a single screen the central model is IntroModel. IntroModel tracks waterlevels across cups, ensures water levels change according to restrictions on space, and calculates mean across the data set.
+As a single screen, the central model is IntroModel. IntroModel tracks waterlevels across cups, ensures water levels change according to restrictions on space, and calculates mean across the data set.
 
 ### View
-- Pipes and Cups (2d/3D) are all created dynamically so must be disposed of properly ( unlink, dispose, removeListener). 
+- Pipes and Cups (2D/3D) are all created dynamically so must be disposed of properly (unlink, dispose, removeListener). 
 - waterCupLayerNode holds all of the cups (2D/3D) and pipes, which properly z-orders elements as they are created and disposed. This node also centers cups and pipes as they are created and disposed.
-- WaterCup2DNode and WaterCup3DNOde implement the model view transform described [above](#model-view-transform)
+- WaterCup2DNode and WaterCup3DNOde implement the model-view transform described [above](#model-view-transform)
 
 ### PhET-iO
 
-**PhetioGroup** is used to manage the dynamic elements in the sim. The dynamic elements are: 2D cups, 3D cups, and pipes.
+**PhetioGroup** is used to manage the dynamic elements in the sim. The dynamic elements are: 2D cups, 3D cups, and pipes.