Fix typo in argparse doc.
diff --git a/Doc/library/argparse.rst b/Doc/library/argparse.rst
index 2b3275c..4f154c4 100644
--- a/Doc/library/argparse.rst
+++ b/Doc/library/argparse.rst
@@ -452,7 +452,7 @@
By default, :class:`ArgumentParser` objects uses ``sys.argv[0]`` to determine
how to display the name of the program in help messages. This default is almost
-always desirable because it will make the help messages match how the pgoram was
+always desirable because it will make the help messages match how the program was
invoked on the command line. For example, consider a file named
``myprogram.py`` with the following code::