Merge pull request #3570 from IanLee1521/update-docstring

Added missing space

pip/cmdoptions.py

@@ -247,7 +247,7 @@ def find_links():
         default=[],
         metavar='url',
         help="If a url or path to an html file, then parse for links to "
-             "archives. If a local path or file:// url that's a directory,"
+             "archives. If a local path or file:// url that's a directory, "
              "then look for archives in the directory listing.")