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/collision_object_bullet.cpp

@@ -39,10 +39,6 @@
 
 #include <btBulletCollisionCommon.h>
 
-/**
-	@author AndreaCatania
-*/
-
 // We enable dynamic AABB tree so that we can actually perform a broadphase on bodies with compound collision shapes.
 // This is crucial for the performance of kinematic bodies and for bodies with transforming shapes.
 #define enableDynamicAabbTree true