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.

editor/plugins/texture_region_editor_plugin.h

@@ -40,10 +40,6 @@
 #include "scene/resources/style_box.h"
 #include "scene/resources/texture.h"
 
-/**
-	@author Mariano Suligoy
-*/
-
 class TextureRegionEditor : public VBoxContainer {
 	GDCLASS(TextureRegionEditor, VBoxContainer);