Changed Area3D node description

Changed description to be less confusing

Changed
"3D area for detection and physics and audio influence."
To
"3D area for detection, physics, and audio influence."

doc/classes/Area3D.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="Area3D" inherits="CollisionObject3D" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
-		3D area for detection and physics and audio influence.
+		3D area for detection, physics, and audio influence.
 	</brief_description>
 	<description>
 		3D area that detects [CollisionObject3D] nodes overlapping, entering, or exiting. Can also alter or override local physics parameters (gravity, damping) and route audio to custom audio buses.