Fixed code examples

Author: Tony Sansone

examples/misc/lib/language_tour/classes/point_alt.dart

@@ -62,11 +62,6 @@ class PointB {
   // Initializing formal parameters can also be optional.
   PointB.optional([this.x = 0.0, this.y = 0.0]);
   PointB.named({required this.x, required this.y});
-
-  // Private fields cannot be used as named initializing formals.
-  PointB.namedPrivate({required double x, required double y})
-      : _x = x,
-        _y = y;
 }
 // #enddocregion initialize-formal
 

src/content/guides/whats-new.md

@@ -560,7 +560,7 @@ we made the following changes to this site:
 [Low-level HTML tutorials]: /web/get-started
 
 [native types]: /interop/c-interop#interfacing-with-native-types
-[initializing formal parameters]: /language/constructors#initializing-formal-parameters
+[initializing formal parameters]: /language/constructors#use-initializing-formal-parameters
 [support for packages]: /tools/dartpad#library-support
 [asynchronous programming codelab]: /codelabs/async-await
 [why asynchronous code matters]: /codelabs/async-await#why-asynchronous-code-matters

src/content/language/classes.md

@@ -369,7 +369,7 @@ can pass a static method as a parameter to a constant constructor.
 [`Type`]: {{site.dart-api}}/{{site.sdkInfo.channel}}/dart-core/Type-class.html
 [type test operator]: /language/operators#type-test-operators
 [Getters and setters]: /language/methods#getters-and-setters
-[initializer list]: /language/constructors#initializer-list
+[initializer list]: /language/constructors#use-an-initializer-list
 [factory constructor]: /language/constructors#factory-constructors
 [late-final-ivar]: /effective-dart/design#avoid-public-late-final-fields-without-initializers
 [nullable type]: /null-safety/understanding-null-safety#using-nullable-types

src/content/language/constructors.md

@@ -420,11 +420,24 @@ class PointB {
   // Initializing formal parameters can also be optional.
   PointB.optional([this.x = 0.0, this.y = 0.0]);
   PointB.named({required this.x, required this.y});
+}
+```
+
+Private fields can't be used as named initializing formals.
+
+{% comment %}
+Don't attach the following example to a code excerpt.
+It doesn't work on purpose and will cause errors in CI.
+{% endcomment %}
+```dart
+class PointB {
+// ...
 
-  // Private fields cannot be used as named initializing formals.
   PointB.namedPrivate({required double x, required double y})
       : _x = x,
         _y = y;
+
+// ...
 }
 ```