Remove duplication.
diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
index 4ed3ec5..b44ed99 100644
--- a/Doc/library/functions.rst
+++ b/Doc/library/functions.rst
@@ -828,7 +828,7 @@
    .. note::
 
       Python doesn't depend on the underlying operating system's notion of text
-      files; all the the processing is done by Python itself, and is therefore
+      files; all the processing is done by Python itself, and is therefore
       platform-independent.
 
    *buffering* is an optional integer used to set the buffering policy.  Pass 0