Fix. typos (#137325)

## Description

This PR fixes typos in 
- `actions.dart`
- `app_bar.dart`
- `basic.dart`
- `button_bar_theme.dart`

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

@@ -2252,14 +2252,14 @@ class _RenderExpandedTitleBox extends RenderShiftedBox {
 
     assert(padding.isNonNegative);
     assert(titleAlignment.y == 1.0);
-    // yAdjustement is the minimum additional y offset to shift the child in
+    // yAdjustment is the minimum additional y offset to shift the child in
     // the visible vertical space when AppBar is fully expanded. The goal is to
     // prevent the expanded title from being clipped when the expanded title
     // widget + the bottom padding is too tall to fit in the flexible space (the
     // top padding is basically ignored since the expanded title is
     // bottom-aligned).
-    final double yAdjustement = clampDouble(childSize.height + padding.bottom - maxExtent, 0, padding.bottom);
-    final double offsetY = size.height - childSize.height - padding.bottom + yAdjustement;
+    final double yAdjustment = clampDouble(childSize.height + padding.bottom - maxExtent, 0, padding.bottom);
+    final double offsetY = size.height - childSize.height - padding.bottom + yAdjustment;
     final double offsetX = (titleAlignment.x + 1) / 2 * (size.width - padding.horizontal - childSize.width) + padding.left;
 
     final BoxParentData childParentData = child.parentData! as BoxParentData;

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

@@ -231,7 +231,7 @@ class ButtonBarThemeData with Diagnosticable {
 ///  * [ButtonBarThemeData], which describes the actual configuration of a button
 ///    bar theme.
 class ButtonBarTheme extends InheritedWidget {
-  /// Constructs a button bar theme that configures all descendent [ButtonBar]
+  /// Constructs a button bar theme that configures all descendant [ButtonBar]
   /// widgets.
   const ButtonBarTheme({
     super.key,

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

@@ -565,7 +565,7 @@ abstract class ContextAction<T extends Intent> extends Action<T> {
 
 /// The signature of a callback accepted by [CallbackAction.onInvoke].
 ///
-/// Such callbacks are implementions of [Action.invoke]. The returned value
+/// Such callbacks are implementations of [Action.invoke]. The returned value
 /// is the return value of [Action.invoke], the argument is the intent passed
 /// to [Action.invoke], and so forth.
 typedef OnInvokeCallback<T extends Intent> = Object? Function(T intent);

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

@@ -5588,7 +5588,7 @@ class Wrap extends MultiChildRenderObjectWidget {
 ///
 /// ## Hit testing and hidden [Flow] widgets
 ///
-/// The [Flow] widget recomputers its children's positions (as used by hit
+/// The [Flow] widget recomputes its children's positions (as used by hit
 /// testing) during the _paint_ phase rather than during the _layout_ phase.
 ///
 /// Widgets like [Opacity] avoid painting their children when those children