Update documentation

Author: adamgraham

Documentation~/articles/data-structures.md

@@ -4,7 +4,9 @@ slug: "/manual/data-structures"
 
 # Data Structures
 
-The **Architecture Toolkit** contains various data structures that may be useful throughout a project. All of the following data structures are available in the package:
+The **Architecture Toolkit** contains various data structures that may be useful throughout a project. The following data structures are available in the package:
+
+<br/>
 
 ## Accumulators
 
@@ -22,6 +24,8 @@ Supported types:
 - [Vector3Int](/api/Zigurous.Architecture/Vector3IntAccumulator)
 - [Vector4](/api/Zigurous.Architecture/Vector4Accumulator)
 
+<hr/>
+
 ## Ranges
 
 Ranges allow you to specify a lower and upper bound which can then be used for a multitude of purposes including clamping values, interpolating numbers, generating random values, and more.
@@ -43,12 +47,14 @@ Included types:
 - [Vector3IntRange](/api/Zigurous.Architecture/Vector3IntRange)
 - [Vector4Range](/api/Zigurous.Architecture/Vector4Range)
 
+<hr/>
+
 ## Misc
 
 - [Bitmask](/api/Zigurous.Architecture/Bitmask) - A bitmask representation that can be used for bitwise operations.
 - [Bool3](/api/Zigurous.Architecture/Bool3) - Stores a tuple of 3 booleans
 - [GridSize](/api/Zigurous.Architecture/GridSize) - Stores the size of a grid as rows and columns.
 - [Quantity\<T\>](/api/Zigurous.Architecture/Quantity-1) - Stores a quantity of a given entity type
-- [Registry\<T\>](/api/Zigurous.Architecture/RegisteredList-1) - Manages a list of unique items and invokes callbacks when an item is added or removed from the list.
+- [Registry\<T\>](/api/Zigurous.Architecture/Registry-1) - Manages a list of unique items and invokes callbacks when an item is added or removed from the list.
 - [RuntimeSet\<T\>](/api/Zigurous.Architecture/RuntimeSet-1) - A ScriptableObject that stores a list of items. A project asset can be created for the runtime set so it can be referenced throughout the application, but the items are added and removed at runtime.
 - [Size](/api/Zigurous.Architecture/Size) - Stores the size of an entity as a width and height

Documentation~/articles/events.md

@@ -6,14 +6,20 @@ slug: "/manual/events"
 
 Events are powerful tool provided by Unity. The **Architecture Toolkit** extends this system by allowing events to be saved as ScriptableObjects. This means the same event can be referenced and listened to by multiple systems throughout the project.
 
+<br/>
+
 ### Game Event
 
 An event can be created through the Asset menu, `Zigurous > Events > Game Event`. There are no properties on an event, but they can be extended further with subclasses if needed. See the [GameEvent](/api/Zigurous.Architecture/GameEvent) Scripting API.
 
+<hr/>
+
 ### Game Event Listener
 
 A [GameEventListener](/api/Zigurous.Architecture/GameEventListener) component can be added to any game object that needs to listen for an event. This is a class that derives from `MonoBehaviour` and will register and unregister itself as a listener for the specified event. The listener also declares a standard `UnityEvent` response property that is invoked when the event is raised.
 
+<hr/>
+
 ### Event Reference
 
 The [EventReference](/api/Zigurous.Architecture/EventReference) class allows a `UnityEvent` or `GameEvent` to be referenced. The option to switch between the two choices is available in the editor. Anywhere you might declare a variable as a `UnityEvent` or a `GameEvent` consider declaring it as an `EventReference` for more flexibility.

Documentation~/articles/extensions.md

@@ -4,7 +4,7 @@ slug: "/manual/extensions"
 
 # Extension Methods
 
-The **Architecture Toolkit** contains hundreds of extension methods that provide enhanced support for common container types and Unity classes. Extension methods are available for the following types:
+The **Architecture Toolkit** contains hundreds of extension methods to provide enhanced support for common container types and Unity classes. See the Scripting API for more information:
 
 #### [Array](/api/Zigurous.Architecture/ArrayExtensions)
 

Documentation~/articles/scriptable-variables.md

@@ -1,5 +1,5 @@
 ---
-slug: "/manual/variables"
+slug: "/manual/scriptable-variables"
 ---
 
 # Scriptable Variables

Runtime/Variables/ScriptableVariable.cs

@@ -5,7 +5,7 @@ namespace Zigurous.Architecture
     /// <summary>
     /// A variable type that derives from ScriptableObject.
     /// </summary>
-    /// <typeparam name="T">The type of value.<typeparam>
+    /// <typeparam name="T">The type of value.</typeparam>
     public abstract class ScriptableVariable<T> : ScriptableObject
     {
         /// <summary>