Fix build errors

Author: SimonDarksideJ

articles/getting_to_know/howto/graphics/HowTo_Draw_3D_Primitives.md

@@ -309,7 +309,7 @@ A triangle strip is a set of triangles that share multiple vertices. This exampl
 
 ### Concepts
 
-- [What Is 3D Rendering?](../../whatis/grasphics/WhatIs_3DRendering.md)
+- [What Is 3D Rendering?](../../whatis/graphics/WhatIs_3DRendering.md)
 
 ### Reference
 

articles/getting_to_know/howto/graphics/HowTo_FitCameraToScene.md

@@ -75,8 +75,8 @@ A simple technique to handle this is to create a [BoundingSphere](xref:Microsoft
 
 ### Concepts
 
-- [What Is a View Frustum?](../../whatis/grasphics/WhatIs_ViewFrustum.md)
-- [What Is a Viewport?](../../whatis/grasphics/WhatIs_Viewport.md)
+- [What Is a View Frustum?](../../whatis/graphics/WhatIs_ViewFrustum.md)
+- [What Is a Viewport?](../../whatis/graphics/WhatIs_Viewport.md)
 
 ### Reference
 

articles/getting_to_know/howto/graphics/HowTo_RenderModel.md

@@ -18,7 +18,7 @@ This example has three main parts:
 
 ## Adding a Model
 
-Follow the steps in [How to add content](HowTo_GameContent_Add.md) in order to add a Model to your project.
+Follow the steps in [How to add content](../content_pipeline/HowTo_GameContent_Add.md) in order to add a Model to your project.
 
 For this example, use the [Fuel Carrier model](https://github.com/MonoGame/MonoGame.Samples/raw/3.8.2/FuelCell/FuelCell.Core/Content/Models/fuelcarrier.fbx) file and its corresponding [diffuse texture](https://github.com/MonoGame/MonoGame.Samples/raw/3.8.2/FuelCell/FuelCell.Core/Content/Models/ShipDiffuse.tga).  But you can use any model file you wish, and set the **Content Importer** to `FBX Importer - MonoGame` and the **Content Processor** is `Model - MonoGame` (which should be the default for an FBX) and Save the solution.