Issue #17047: removed doubled words in Doc/*, Mac/*, and Tool/*
found by Serhiy Storchaka and Matthew Barnett
diff --git a/Doc/c-api/intro.rst b/Doc/c-api/intro.rst
index e136816..6464fe7 100644
--- a/Doc/c-api/intro.rst
+++ b/Doc/c-api/intro.rst
@@ -433,7 +433,7 @@
.. index:: single: sum_sequence()
A simple example of detecting exceptions and passing them on is shown in the
-:c:func:`sum_sequence` example above. It so happens that that example doesn't
+:c:func:`sum_sequence` example above. It so happens that this example doesn't
need to clean up any owned references when it detects an error. The following
example function shows some error cleanup. First, to remind you why you like
Python, we show the equivalent Python code::