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/rendering/renderer_rd/shader_rd.h

@@ -40,11 +40,6 @@
 #include "core/variant/variant.h"
 #include "servers/rendering_server.h"
 
-#include <stdio.h>
-/**
-	@author Juan Linietsky <reduzio@gmail.com>
-*/
-
 class ShaderRD {
 	//versions
 	CharString general_defines;
@@ -173,4 +168,4 @@ public:
 	virtual ~ShaderRD();
 };
 
-#endif
+#endif // SHADER_RD_H