adjust linebreak in argparse docs

Author: jkunimune

Doc/library/argparse.rst

@@ -739,9 +739,9 @@ By default, :mod:`!argparse` automatically handles the internal naming and
 display names of arguments, simplifying the process without requiring
 additional configuration.
 As such, you do not need to specify the dest_ and metavar_ parameters.
-For optional arguments, the dest_ parameter defaults to the argument name, with underscores ``_``
-replacing hyphens ``-``. The metavar_
-parameter defaults to the upper-cased name. For example::
+For optional arguments, the dest_ parameter defaults to the argument name, with
+underscores ``_`` replacing hyphens ``-``. The metavar_ parameter defaults to
+the upper-cased name. For example::
 
    >>> parser = argparse.ArgumentParser(prog='PROG')
    >>> parser.add_argument('--foo-bar')