Move imageFormats template to instantiateImageCodec dartdoc (flutter#34948)

Author: srawlins

lib/ui/painting.dart

@@ -15,14 +15,6 @@ part of dart.ui;
 // Painting APIs will also warn about arguments representing NaN coordinates,
 // which can not be rendered by Skia.
 
-// Update this list when changing the list of supported codecs.
-/// {@template dart.ui.imageFormats}
-/// JPEG, PNG, GIF, Animated GIF, WebP, Animated WebP, BMP, and WBMP. Additional
-/// formats may be supported by the underlying platform. Flutter will
-/// attempt to call platform API to decode unrecognized formats, and if the
-/// platform API supports decoding the image Flutter will be able to render it.
-/// {@endtemplate}
-
 bool _rectIsValid(Rect rect) {
   assert(rect != null, 'Rect argument was null.');
   assert(!rect.hasNaN, 'Rect argument contained a NaN value.');
@@ -2029,7 +2021,14 @@ class Codec extends NativeFieldWrapperClass1 {
 ///
 /// The `list` parameter is the binary image data (e.g a PNG or GIF binary data).
 /// The data can be for either static or animated images. The following image
-/// formats are supported: {@macro dart.ui.imageFormats}
+/// formats are supported:
+// Update this list when changing the list of supported codecs.
+/// {@template dart.ui.imageFormats}
+/// JPEG, PNG, GIF, Animated GIF, WebP, Animated WebP, BMP, and WBMP. Additional
+/// formats may be supported by the underlying platform. Flutter will
+/// attempt to call platform API to decode unrecognized formats, and if the
+/// platform API supports decoding the image Flutter will be able to render it.
+/// {@endtemplate}
 ///
 /// The `targetWidth` and `targetHeight` arguments specify the size of the
 /// output image, in image pixels. If they are not equal to the intrinsic