Small updates based on PR feedback.

Code/Framework/AzCore/AzCore/Serialization/Json/JsonSerialization.h

@@ -49,6 +49,9 @@ namespace AZ
     //! Note on pointers: The Json Serialization assumes that are always constructed, so a default JSON value of "{}" is interpret as
     //!     creating a new default instance even if the default value is a null pointer. A JSON Null needs to be explicitly stored in
     //!     the JSON Document in order to default or explicitly set a pointer to null.
+    //! Note on pointer memory: Objects created/destroyed by the Json Serialization for pointers require that the AZ_CLASS_ALLOCATOR is
+    //!     declared and the object is created using aznew or memory is allocated using azmalloc. Without these the application may
+    //!     crash if the Json Serialization tries to create or destroy an object pointed to by a pointer.
     class JsonSerialization final
     {
     public:

Code/Framework/AzCore/Tests/Serialization/Json/BaseJsonSerializerTests.cpp

@@ -140,7 +140,7 @@ namespace JsonSerializationTests
         ASSERT_NE(nullptr, ptrValue);
         EXPECT_EQ(42, *ptrValue);
 
-        azfree(ptrValue, AZ::SystemAllocator, sizeof(int), AZStd::alignment_of<int>::value);
+        azfree(ptrValue, AZ::SystemAllocator, sizeof(int), alignof(int));
     }
 
     TEST_F(BaseJsonSerializerTests, ContinueLoading_DefaultToNullPointer_ValueLoadedCorrectly)
@@ -155,7 +155,7 @@ namespace JsonSerializationTests
         EXPECT_EQ(Processing::Completed, result.GetProcessing());
         ASSERT_NE(nullptr, ptrValue);
         
-        azfree(ptrValue, AZ::SystemAllocator, sizeof(int), AZStd::alignment_of<int>::value);
+        azfree(ptrValue, AZ::SystemAllocator, sizeof(int), alignof(int));
     }
 
     TEST_F(BaseJsonSerializerTests, ContinueLoading_NullDeletesObject_ValueLoadedCorrectly)
@@ -163,7 +163,7 @@ namespace JsonSerializationTests
         using namespace AZ::JsonSerializationResult;
 
         rapidjson::Value json(rapidjson::kNullType);
-        int* ptrValue = reinterpret_cast<int*>(azmalloc(sizeof(int), AZStd::alignment_of<int>::value, AZ::SystemAllocator));
+        int* ptrValue = reinterpret_cast<int*>(azmalloc(sizeof(int), alignof(int), AZ::SystemAllocator));
 
         ResultCode result = ContinueLoading(&ptrValue, azrtti_typeid<int>(), json, *m_jsonDeserializationContext, Flags::ResolvePointer);