Fix an example

Doc/whatsnew/whatsnew23.tex

@@ -79,7 +79,6 @@ Set([])
 >>> S1 & S2                  # Alternative notation
 Set([])
 >>> S1.union_update(S2)
-Set([1, 2, 3, 4, 5, 6])
 >>> S1
 Set([1, 2, 3, 4, 5, 6])
 >>>
@@ -2015,7 +2014,7 @@ name.
 The author would like to thank the following people for offering
 suggestions, corrections and assistance with various drafts of this
 article: Simon Brunning, Michael Chermside, Scott David Daniels,
-Fred~L. Drake, Jr., Raymond Hettinger, Michael Hudson, Detlef Lannert,
+Fred~L. Drake, Jr., Kelly Gerber, Raymond Hettinger, Michael Hudson, Detlef Lannert,
 Martin von L\"owis, Andrew MacIntyre, Lalo Martins, Gustavo Niemeyer,
 Neal Norwitz, Chris Reedy, Vinay Sajip, Neil Schemenauer, Jason
 Tishler.