bpo-35110: Fix yet few spaces before dashes. (GH-10255)

diff --git a/Doc/library/optparse.rst b/Doc/library/optparse.rst
index 4f7bd43..3afc77b 100644
--- a/Doc/library/optparse.rst
+++ b/Doc/library/optparse.rst
@@ -379,8 +379,8 @@
 Handling boolean (flag) options
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-Flag options---set a variable to true or false when a particular option is seen
----are quite common.  :mod:`optparse` supports them with two separate actions,
+Flag options---set a variable to true or false when a particular option is
+seen---are quite common.  :mod:`optparse` supports them with two separate actions,
 ``store_true`` and ``store_false``.  For example, you might have a ``verbose``
 flag that is turned on with ``-v`` and off with ``-q``::