Fix the the typos (#49442)

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

@@ -292,7 +292,7 @@ class AlertDialog extends StatelessWidget {
   /// from the [actions].
   final List<Widget> actions;
 
-  /// Padding around the the set of [actions] at the bottom of the dialog.
+  /// Padding around the set of [actions] at the bottom of the dialog.
   ///
   /// Typically used to provide padding to the button bar between the button bar
   /// and the edges of the dialog.

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

@@ -688,7 +688,7 @@ class ThemeData extends Diagnosticable {
   /// is -4), to [VisualDensity.maximumDensity] (which is 4), inclusive, where
   /// negative values indicate a denser, more compact, UI, and positive values
   /// indicate a less dense, more expanded, UI. If a component doesn't support
-  /// the value given, it will clamp to the the nearest supported value.
+  /// the value given, it will clamp to the nearest supported value.
   ///
   /// The default for visual densities is zero for both vertical and horizontal
   /// densities, which corresponds to the default visual density of components