Separate source link from main text.
diff --git a/Doc/library/threading.rst b/Doc/library/threading.rst
index 03ff44c..7f0628d 100644
--- a/Doc/library/threading.rst
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@@ -6,6 +6,8 @@
 
 **Source code:** :source:`Lib/threading.py`
 
+--------------
+
 This module constructs higher-level threading interfaces on top of the lower
 level :mod:`_thread` module.  See also the :mod:`queue` module.