Removed duplicated words in in comments and docs.

diff --cc Doc/whatsnew/3.3.rst
Simple merge

diff --cc Lib/test/test_docxmlrpc.py
Simple merge

diff --cc Lib/test/test_xmlrpc.py
Simple merge

diff --cc Lib/test/test_zipimport_support.py
Simple merge

diff --cc Lib/xml/etree/ElementTree.py
Simple merge

diff --cc Misc/HISTORY
Simple merge

diff --cc Misc/NEWS
Simple merge

diff --cc Modules/_tracemalloc.c
Simple merge

diff --cc Modules/posixmodule.c
Simple merge

diff --cc Python/random.c
Simple merge

diff --cc Python/thread.c
Simple merge