Remove trailing whitespace.
diff --git a/Doc/library/optparse.rst b/Doc/library/optparse.rst
index fbc2de2..e201d22 100644
--- a/Doc/library/optparse.rst
+++ b/Doc/library/optparse.rst
@@ -799,7 +799,7 @@
The keyword arguments define attributes of the new Option object. The most
important option attribute is :attr:`action`, and it largely determines which
other attributes are relevant or required. If you pass irrelevant option
-attributes, or fail to pass required ones, :mod:`optparse` raises an
+attributes, or fail to pass required ones, :mod:`optparse` raises an
:exc:`OptionError` exception explaining your mistake.
An option's *action* determines what :mod:`optparse` does when it encounters