Update VERSION2.md example to use core types and <object> syntax

- Use int32 instead of int for primary keys
- Use <object> with angle brackets for AttributeType syntax

Co-authored-by: dimitri-yatsenko <dimitri@datajoint.com>

Author: claude

VERSION2.md

@@ -25,11 +25,11 @@ The new `object` type provides managed file/folder storage tightly coupled with
 @schema
 class Recording(dj.Manual):
     definition = """
-    subject_id : int
-    session_id : int
+    subject_id : int32
+    session_id : int32
     ---
-    raw_data : object              # uses default store
-    published : object@public      # uses named store
+    raw_data : <object>              # uses default store
+    published : <object@public>      # uses named store
     """
 ```