fix various doc typos #3320
diff --git a/Doc/extending/windows.rst b/Doc/extending/windows.rst
index a0782a7..1811277 100644
--- a/Doc/extending/windows.rst
+++ b/Doc/extending/windows.rst
@@ -23,7 +23,7 @@
This chapter mentions a number of filenames that include an encoded Python
version number. These filenames are represented with the version number shown
- as ``XY``; in practive, ``'X'`` will be the major version number and ``'Y'``
+ as ``XY``; in practice, ``'X'`` will be the major version number and ``'Y'``
will be the minor version number of the Python release you're working with. For
example, if you are using Python 2.2.1, ``XY`` will actually be ``22``.