Clarify some docs

Fix #1476

flask/helpers.py

@@ -814,7 +814,7 @@ class _PackageBoundObject(object):
     @property
     def has_static_folder(self):
         """This is ``True`` if the package bound object's container has a
-        folder named ``'static'``.
+        folder for static files.
 
         .. versionadded:: 0.5
         """

flask/json.py

@@ -85,7 +85,7 @@ class JSONEncoder(_json.JSONEncoder):
 
 class JSONDecoder(_json.JSONDecoder):
     """The default JSON decoder.  This one does not change the behavior from
-    the default simplejson encoder.  Consult the :mod:`json` documentation
+    the default simplejson decoder.  Consult the :mod:`json` documentation
     for more information.  This decoder is not only used for the load
     functions of this module but also :attr:`~flask.Request`.
     """