[#255] Remove docs about having to put empty json dicts in api requests

It seems that you no longer need to provide an empty json dict or param
list when making an api request that has no params.

doc/api.rst

@@ -10,11 +10,11 @@ calls the CKAN API.  For example, using the CKAN API your app can:
 
 * Get JSON-formatted lists of a site's datasets, groups or other CKAN objects:
 
-  http://demo.ckan.org/api/3/action/package_list?foo
+  http://demo.ckan.org/api/3/action/package_list
 
-  http://demo.ckan.org/api/3/action/group_list?foo
+  http://demo.ckan.org/api/3/action/group_list
 
-  http://demo.ckan.org/api/3/action/tag_list?foo
+  http://demo.ckan.org/api/3/action/tag_list
 
 * Get a full JSON representation of a dataset, resource or other object:
 
@@ -34,7 +34,7 @@ calls the CKAN API.  For example, using the CKAN API your app can:
 
 * Get an activity stream of recently changed datasets on a site:
 
-  http://demo.ckan.org/api/3/action/recently_changed_packages_activity_list?foo
+  http://demo.ckan.org/api/3/action/recently_changed_packages_activity_list
 
 
 
@@ -157,20 +157,6 @@ different sites running different versions of CKAN, the result of an API
 request that doesn't specify the API version number cannot be relied on.
 
 
-Making an API Request with No Parameters
-----------------------------------------
-
-If the API function you're calling doesn't require any parameters, you still
-need to post an empty dictionary. For example, with HTTPie::
-
-    http http://demo.ckan.org/api/3/action/package_list body=''
-
-Or, in Python::
-
-    response = urllib2.urlopen(
-        'http://demo.ckan.org/api/3/action/group_list', '{}')
-
-
 Authentication and API Keys
 ---------------------------
 
@@ -208,8 +194,13 @@ GET-able API Functions
 ----------------------
 
 Functions defined in :doc:`ckan.logic.action.get` can also be called with an HTTP
-GET request.  For example, to search for datasets (packages) matching the
-search query ``spending``, on demo.ckan.org, open this URL in your browser:
+GET request.  For example, to get the list of datasets (packages) from
+demo.ckan.org, open this URL in your browser::
+
+http://demo.ckan.org/api/3/action/package_list
+
+Or, to search for datasets (packages) matching the search query ``spending``,
+on demo.ckan.org, open this URL in your browser:
 
 http://demo.ckan.org/api/3/action/package_search?q=spending
 
@@ -230,12 +221,6 @@ value can be sent by giving the parameter multiple times in the URL:
 
 http://demo.ckan.org/api/3/action/term_translation_show?terms=russian&terms=romantic%20novel
 
-If the action you're calling doesn't require any parameters, you still need
-to add a fake parameter to the URL. For example to get a list of all
-datasets on demo.ckan.org:
-
-http://demo.ckan.org/api/3/action/package_list?foo
-
 
 JSONP Support
 -------------