Fix internal links

source/presentation/4.0/index.md

@@ -283,7 +283,7 @@ In addition to the required properties [`id`][prezi-40-model-id] and [`type`][pr
 
 ### Containers as Content Resources
 
-Containers may also be treated as Content Resources and painted into other Containers. This allows composition of content, such as painting a Canvas bearing a Video into a Scene, or painting a 3D model along with its associated Lights into an encompassing Scene. This capability is described further in the [Nesting Containers section](#nesting-containeras).
+Containers may also be treated as Content Resources and painted into other Containers. This allows composition of content, such as painting a Canvas bearing a Video into a Scene, or painting a 3D model along with its associated Lights into an encompassing Scene. This capability is described further in [Nesting Containers](#nesting-containers).
 
 ### Referencing Parts of Resources
 
@@ -530,7 +530,7 @@ The Light is green and has a position, but has its default orientation of lookin
 
 >
 **Key Points**
-* This example uses some of the Scene-Specific resources introduced in [3D Supporting Resources](#3d-supporting-resources).
+* This example uses some of the Scene-specific resources introduced in [Scene](#scene).
 * A Point Selector explicitly places the model in the Scene via the Painting Annotation's [`target`][prezi-40-model-target] property. In the previous example, there was an implicit Point Selector placing the model at (0,0,0) because no explicit Point Selector was provided.
 * The provided Light should replace any default lighting the client might have.
 {: .callout}

source/presentation/4.0/model.md

@@ -534,7 +534,7 @@ If there is a need to distinguish between Content Resources, then all such resou
 
 Containers _MAY_ be treated as content resources for the purposes of annotating on to other Containers. In this situation, the Container _MAY_ be [embedded][prezi40-terminology] within the Annotation, be a reference within the same Manifest, or require dereferencing to obtain its description. This is often described as "nesting".
 
-A Canvas painted into a Scene has special requirements. The top-left corner of the Canvas _MUST_ be aligned with either the Scene coordinate origin by default or with a specific 3D point in the Scene if a [Point Selector](#point-selector) is used. The Canvas _MUST_ be scaled to the Scene such that Canvas coordinate dimensions after any [Transforms](#transforms) are applied correspond to Scene coordinate dimensions with 1:1 scaling. A Canvas painted into a Scene as an Annotation has forward and backward faces, and by default the forward face is toward the positive z axis of the Scene, though this may be modified by Transforms. The content of the Canvas _SHOULD_ be displayed on the forward face, and the backward face _SHOULD_ display either any `backgroundColor` of the Canvas or a reverse view of the content.
+A Canvas painted into a Scene has special requirements. The top-left corner of the Canvas _MUST_ be aligned with either the Scene coordinate origin by default or with a specific 3D point in the Scene if a [Point Selector](#point-selector) is used. The Canvas _MUST_ be scaled to the Scene such that Canvas coordinate dimensions after any [Transforms](#Transforms) are applied correspond to Scene coordinate dimensions with 1:1 scaling. A Canvas painted into a Scene as an Annotation has forward and backward faces, and by default the forward face is toward the positive z axis of the Scene, though this may be modified by Transforms. The content of the Canvas _SHOULD_ be displayed on the forward face, and the backward face _SHOULD_ display either any `backgroundColor` of the Canvas or a reverse view of the content.
 
 A Scene painted into a Scene has two special processing rules. The first is that any `backgroundColor` of the Scene to be painted _SHOULD_ be ignored. The second is that when both Scenes have Image-Based Light Annotations, clients _MAY_ ignore any Image-Based Light Annotation of the Scene to be painted.