PEP 439: Resolve dangling hyphens (#3351)

Author: AA-Turner

pep-0439.txt

@@ -189,8 +189,8 @@ Implementation
 ==============
 
 The changes to pip required by this PEP are being tracked in that project's
-issue tracker [2]_. Most notably, the addition of --bootstrap and --bootstrap-
-to-system to the pip command-line.
+issue tracker [2]_. Most notably, the addition of --bootstrap and
+--bootstrap-to-system to the pip command-line.
 
 It would be preferable that the pip and setuptools projects distribute a wheel
 format download.