httpconnection: remove obsolete comment about open()

When httpsendfile was moved from url.py into httpconnection.py in
e7525a555a64 (url: use new http support if requested by the user,
2011-05-06), the comment about not being able to just call open()
became obsolete.

mercurial/httpconnection.py

@@ -33,9 +33,6 b' class httpsendfile(object):'
     """
 
     def __init__(self, ui, *args, **kwargs):
-        # We can't just "self._data = open(*args, **kwargs)" here because there
-        # is an "open" function defined in this module that shadows the global
-        # one
         self.ui = ui
         self._data = open(*args, **kwargs)
         self.seek = self._data.seek