tracemalloc: 'pretty top' example no longer changes the filename (GH-18903)


I've used this recipe a couple times and the filename editing has always
been less than useful and something I've removed. This is because many
modules end up losing which package they are located in, e.g. `util/date.py`.
(cherry picked from commit d06eec218eac81225f9017951cddfc211fed9325)

Co-authored-by: Adam Johnson <me@adamj.eu>
diff --git a/Doc/library/tracemalloc.rst b/Doc/library/tracemalloc.rst
index 2d327c0..000c0ee 100644
--- a/Doc/library/tracemalloc.rst
+++ b/Doc/library/tracemalloc.rst
@@ -202,10 +202,8 @@
         print("Top %s lines" % limit)
         for index, stat in enumerate(top_stats[:limit], 1):
             frame = stat.traceback[0]
-            # replace "/path/to/module/file.py" with "module/file.py"
-            filename = os.sep.join(frame.filename.split(os.sep)[-2:])
             print("#%s: %s:%s: %.1f KiB"
-                  % (index, filename, frame.lineno, stat.size / 1024))
+                  % (index, frame.filename, frame.lineno, stat.size / 1024))
             line = linecache.getline(frame.filename, frame.lineno).strip()
             if line:
                 print('    %s' % line)