bpo-36625: Remove obsolete comments from docstrings in fractions module (GH-12822)

Remove left-over references to Python 3.0 as the future in Fraction class docstrings.
diff --git a/Misc/ACKS b/Misc/ACKS
index 5d7181d..393ea20 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1099,6 +1099,7 @@
 Zubin Mithra
 Florian Mladitsch
 Doug Moen
+Jakub Molinski
 Juliette Monsel
 The Dragon De Monsyne
 Bastien Montagne