Style: Remove inconsistently used @author docstrings

Each file in Godot has had multiple contributors who co-authored it over the
years, and the information of who was the original person to create that file
is not very relevant, especially when used so inconsistently.

`git blame` is a much better way to know who initially authored or later
modified a given chunk of code, and most IDEs now have good integration to
show this information.

modules/bullet/btRayShape.cpp

@@ -34,10 +34,6 @@
 
 #include <LinearMath/btAabbUtil2.h>
 
-/**
-	@author AndreaCatania
-*/
-
 btRayShape::btRayShape(btScalar length) :
 		btConvexInternalShape() {
 	m_shapeType = CUSTOM_CONVEX_SHAPE_TYPE;