fix(Answer placeholder in Creating Generics #3): Corrected placeholder code

The commented code in the placeholder did not match the expected code.

Closes https://youtrack.jetbrains.com/issue/EDC-456

Power Tools/Creating Generics/Exercise 3/task-info.yaml

@@ -10,10 +10,12 @@ files:
     length: 202
     placeholder_text: |-
       /*
-        val cg: Crate<Grape> = Crate(Grape())
-        val oc: OutCrate<Can> = cg
-        val cc: Crate<Can> = Crate(Can())
-        val ic: InCrate<Grape> = cc
+        val catBox: Box<Cat> = Box(Cat())
+        val outBoxAny: OutBox<Any> = catBox
+        val a: Any = outBoxAny.get()
+        val inBoxAny: InBox<Any> = Box(217)
+        val inBoxCat: InBox<Any> = inBoxAny
+        inBoxCat.put(Cat())
       */
 - name: test/Tests.kt
   visible: false