[Docs] - Fix code examples

Author: matthew-carroll

doc/website/source/_includes/components/code_two_column.jinja

@@ -42,7 +42,7 @@
     LogicalKeyboardKey.left,
   );
   await tester.sendKeyUpEvent(
-    LogicalKeyboardKey.left,
+    LogicalKeyboardKey.alt,
   );
   await tester.sendKeyUpEvent(
     LogicalKeyboardKey.meta,

doc/website/source/index.md

@@ -35,7 +35,7 @@ When you want to simulate hardware keyboard text input, `flutter_test_robots` ma
 testWidgets((tester) async {
   // Setup the test.
     
-  // Type “Hello, World!” via IME.
+  // Type “Hello, World!” via physical keyboard.
   await tester.typeKeyboardText(
     "Hello, World!"
   );