Update outdated reference to Mercurial (GH-12857)

diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index 5a7647b7e99d61d6565c6aed1f2e8a6a94d7b909..339625ad38021ff4fa33c082f5f9311f3896ec8c 100644 (file)
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -1030,7 +1030,7 @@ always available.
 
    .. note::
       Python is now `developed <https://docs.python.org/devguide/>`_ using
-      Mercurial.  In recent Python 2.7 bugfix releases, :data:`subversion`
+      Git.  In recent Python 2.7 bugfix releases, :data:`subversion`
       therefore contains placeholder information.  It is removed in Python
       3.3.