docs: Fix exception thrown in ember quest tutorial (#3228)

Ember quest's run button was throwing an `unimplemented error`. This was
happening was `EmberQuestGame.loadGameSegments`'s pattern matching was
failing to match the block types. It seems for patterns involving
`Type`, the correct way is to use `const (Foo)`. See second example
[here](https://dart.dev/tools/linter-rules/type_literal_in_constant_pattern#details).

doc/tutorials/platformer/app/lib/ember_quest.dart

@@ -57,19 +57,19 @@ class EmberQuestGame extends FlameGame
   void loadGameSegments(int segmentIndex, double xPositionOffset) {
     for (final block in segments[segmentIndex]) {
       final component = switch (block.blockType) {
-        GroundBlock _ => GroundBlock(
+        const (GroundBlock) => GroundBlock(
             gridPosition: block.gridPosition,
             xOffset: xPositionOffset,
           ),
-        PlatformBlock _ => PlatformBlock(
+        const (PlatformBlock) => PlatformBlock(
             gridPosition: block.gridPosition,
             xOffset: xPositionOffset,
           ),
-        Star _ => Star(
+        const (Star) => Star(
             gridPosition: block.gridPosition,
             xOffset: xPositionOffset,
           ),
-        WaterEnemy _ => WaterEnemy(
+        const (WaterEnemy) => WaterEnemy(
             gridPosition: block.gridPosition,
             xOffset: xPositionOffset,
           ),

doc/tutorials/platformer/step_6.md

@@ -73,7 +73,7 @@ class HeartHealthComponent extends SpriteGroupComponent<HeartState>
 
 ```
 
-The `HeartHealthComponent` is just a [SpriteGroupComponent](../../flame/components.md#spritegroup)
+The `HeartHealthComponent` is just a [SpriteGroupComponent](../../flame/components.md#spritegroupcomponent)
 that uses the heart images that were created early on. The unique thing that is being done, is when
 the component is created, it requires a `heartNumber`, so in the `update` method, we check to see if
 the `game.health` is less than the `heartNumber` and if so, change the state of the component to