Issue #17047: removed doubled words in Doc/*, Mac/*, and Tool/*
found by Serhiy Storchaka and Matthew Barnett
diff --git a/Doc/library/xml.dom.rst b/Doc/library/xml.dom.rst
index 297fc0c..1a3a6a4 100644
--- a/Doc/library/xml.dom.rst
+++ b/Doc/library/xml.dom.rst
@@ -357,7 +357,7 @@
Add a new child node to this node at the end of the list of
children, returning *newChild*. If the node was already in
- in the tree, it is removed first.
+ the tree, it is removed first.
.. method:: Node.insertBefore(newChild, refChild)