Move versionadded for tracemalloc into the standard location (right after title)

Doc/library/tracemalloc.rst

@@ -4,6 +4,8 @@
 .. module:: tracemalloc
    :synopsis: Trace memory allocations.
 
+.. versionadded:: 3.4
+
 The tracemalloc module is a debug tool to trace memory blocks allocated by
 Python. It provides the following information:
 
@@ -23,8 +25,6 @@ frame (1 frame). To store 25 frames at startup: set the
 :envvar:`PYTHONTRACEMALLOC` environment variable to ``25``, or use the
 :option:`-X` ``tracemalloc=25`` command line option.
 
-.. versionadded:: 3.4
-
 
 Examples
 ========