Move package xml before copyright

Having the same copyright on all files made the documentation script
to include it multiple times in the package information.

core/encoding/xml/debug_print.odin

@@ -1,3 +1,5 @@
+package xml
+
 /*
 	An XML 1.0 / 1.1 parser
 
@@ -9,7 +11,7 @@
 	List of contributors:
 		Jeroen van Rijn: Initial implementation.
 */
-package xml
+
 
 import "core:io"
 import "core:fmt"
@@ -81,4 +83,4 @@ print_element :: proc(writer: io.Writer, doc: ^Document, element_id: Element_ID,
 	}
 
 	return written, .None
-}
+}