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.

servers/navigation_server_2d.h

@@ -28,12 +28,8 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
-/**
-	@author AndreaCatania
-*/
-
-#ifndef NAVIGATION_2D_SERVER_H
-#define NAVIGATION_2D_SERVER_H
+#ifndef NAVIGATION_SERVER_2D_H
+#define NAVIGATION_SERVER_2D_H
 
 #include "core/object/class_db.h"
 #include "core/templates/rid.h"
@@ -171,4 +167,4 @@ public:
 	virtual ~NavigationServer2D();
 };
 
-#endif
+#endif // NAVIGATION_SERVER_2D_H