Fixed a few spots in the docs that were still using json as a property.

docs/index.rst

@@ -27,7 +27,7 @@ Things shouldn’t be this way. Not in Python.
     'utf-8'
     >>> r.text
     u'{"type":"User"...'
-    >>> r.json
+    >>> r.json()
     {u'private_gists': 419, u'total_private_repos': 77, ...}
 
 See `similar code, without Requests <https://gist.github.com/973705>`_.

docs/user/quickstart.rst

@@ -128,10 +128,10 @@ There's also a builtin JSON decoder, in case you're dealing with JSON data::
 
     >>> import requests
     >>> r = requests.get('https://github.com/timeline.json')
-    >>> r.json
+    >>> r.json()
     [{u'repository': {u'open_issues': 0, u'url': 'https://github.com/...
 
-In case the JSON decoding fails, ``r.json`` simply returns ``None``.
+In case the JSON decoding fails, ``r.json`` raises an exception.
 
 
 Raw Response Content