Issue #17047: removed doubled words in Doc/*, Mac/*, and Tool/*
found by Serhiy Storchaka and Matthew Barnett
diff --git a/Tools/pybench/README b/Tools/pybench/README
index 022c8de..2061cab 100644
--- a/Tools/pybench/README
+++ b/Tools/pybench/README
@@ -3,7 +3,7 @@
 PYBENCH - A Python Benchmark Suite
 ________________________________________________________________________
 
-     Extendable suite of of low-level benchmarks for measuring
+     Extendable suite of low-level benchmarks for measuring
           the performance of the Python implementation 
                  (interpreter, compiler or VM).