more formatting for readthedocs

docs/aframe-extra-collection.md

@@ -4,72 +4,72 @@
 
 A collection of miscellaneous components with varying degrees of usefulness.
 
-# **rounded**
+## **rounded**
 
 <hr>
 
 Creates a flat 2D rectangle with rounded corners. The appearance can be modified with [A-Frame 'material' component](https://aframe.io/docs/master/components/material.html).
 
-##### Example
+### Example
 
 ```html
 <a-entity rounded="radius: 0.05; width: 1; height: 2;" material="color: blue;"></a-entity>
 ```
 
-##### Properties
+### Properties
 
 | Property | Property Type | Default Value |  Description  |
 |---|---|---|---|
 |  radius | _number_ |  0.0125 |  The radius of the rounded corners in meters. Note: this is in _addition_ to the width & height. |
 |  width | _number_  |  1  | The width of the rectangle. |
 |  height | _number_  |  1  | The height of the rectangle. |
 
-# **clamp**
+## **clamp**
 
 <hr>
 
 Restricts the movement of an object to a volume specified by minimum and maximum values in world space; Objects with the _clamp_ component cannot move beyond the limits defined by the min and max values.
 
-##### Example
+### Example
 
 ```html
 <a-entity position="0 1 -1" clamp="min: -2 -4 -1; max: 2 5 3"></a-entity>
 ```
 
-##### Properties
+### Properties
 
 | Property | Property Type | Default Value |  Description  |
 |---|---|---|---|
 |  min | _Vector3_  |  {x:-1,y:-1,z:-1}  | The minimum allowed world position by axis. |
 |  max | _Vector3_  |  {x:1,y:1,z:1}  | The maximum allowed world position by axis. |
 
-# **log-object3D**
+## **log-object3D**
 
 <hr>
 
 Calls `console.log` after a mesh is loaded;
 
-##### Example
+### Example
 
 ```html
 <a-entity log-object3D></a-entity>
 <!-- returns 'Object3D: { .. etc ... }'-->
 ```
 
-# **billboard**
+## **billboard**
 
 <hr>
 
 Aligns the Z-axis of an entity to always face towards a specified entity;
 
-##### Example
+### Example
 
 ```html
 <a-entity id="foo" ></a-entity>
 <a-entity billboard="src: #foo;"></a-entity>
 ```
 
-##### Properties
+### Properties
 
 | Property | Property Type | Default Value |  Description  |
 |---|---|---|---|