docs: change `icon` help output to ask for 1024px source icons, closes #7886 (#7896)

tooling/cli/src/icon.rs

@@ -47,8 +47,7 @@ impl PngTarget {
 #[derive(Debug, Parser)]
 #[clap(about = "Generates various icons for all major platforms")]
 pub struct Options {
-  // TODO: Confirm 1240px
-  /// Path to the source icon (png, 1240x1240px with transparency).
+  /// Path to the source icon (png, 1024x1024px with transparency).
   #[clap(default_value = "./app-icon.png")]
   input: PathBuf,
   /// Output directory.