Issue #17047: removed doubled words in Doc/*, Mac/*, and Tool/*
found by Serhiy Storchaka and Matthew Barnett
Issue #17047: remove doubled words found in 2.7 to 3.4 Modules/*,
as reported by Serhiy Storchaka and Matthew Barnett.
Issue #17047: remove doubled words found in 2.7 to 3.4 Lib/*,
as reported by Serhiy Storchaka and Matthew Barnett.
Issue #11367: fix documentation of some find* methods in ElementTree