core: improve package doc comments for the documentation generator

core/image/png/png.odin

@@ -8,9 +8,6 @@
 */
 
 
-// package png implements a PNG image reader
-//
-// The PNG specification is at https://www.w3.org/TR/PNG/.
 //+vet !using-stmt
 package png
 
@@ -1619,4 +1616,4 @@ defilter :: proc(img: ^Image, filter_bytes: ^bytes.Buffer, header: ^image.PNG_IH
 @(init, private)
 _register :: proc() {
 	image.register(.PNG, load_from_bytes, destroy)
-}
+}