Doc: Image.memory only accepts compressed format (#37790)

See https://github.com/flutter/flutter/issues/37423

packages/flutter/lib/src/widgets/image.dart

@@ -533,6 +533,10 @@ class Image extends StatefulWidget {
   ///
   /// The [bytes], [scale], and [repeat] arguments must not be null.
   ///
+  /// This only accepts compressed image formats (e.g. PNG). Uncompressed
+  /// formats like rawRgba (the default format of [ui.Image.toByteData]) will
+  /// lead to exceptions.
+  ///
   /// Either the [width] and [height] arguments should be specified, or the
   /// widget should be placed in a context that sets tight layout constraints.
   /// Otherwise, the image dimensions will change as the image is loaded, which