missing namespace

Author: sentrivana

docs/platforms/python/migration/2.x-to-3.x.mdx

@@ -86,7 +86,7 @@ If you start a span, it will automatically become the child of the currently act
 ```python
 with sentry_sdk.start_span(name="parent"):
     with sentry_sdk.start_span(name="child-of-parent"):    
-        with new_trace():
+        with sentry_sdk.new_trace():
             # The first span started in this context manager will become
             # a new transaction (root span) with its own trace
             with sentry_sdk.start_span(name="new-parent"):