Fix typo (#28558)

packages/flutter/lib/src/material/input_decorator.dart

@@ -2183,7 +2183,7 @@ class InputDecoration {
   /// To create a collapsed input decoration, use [InputDecoration..collapsed].
   final bool isCollapsed;
 
-  /// An icon that that appears before the [prefix] or [prefixText] and before
+  /// An icon that appears before the [prefix] or [prefixText] and before
   /// the editable part of the text field, within the decoration's container.
   ///
   /// The size and color of the prefix icon is configured automatically using an
@@ -2257,7 +2257,7 @@ class InputDecoration {
   ///  * [suffixStyle], the equivalent but on the trailing edge.
   final TextStyle prefixStyle;
 
-  /// An icon that that appears after the editable part of the text field and
+  /// An icon that appears after the editable part of the text field and
   /// after the [suffix] or [suffixText], within the decoration's container.
   ///
   /// The size and color of the suffix icon is configured automatically using an