Fix some reST field lists in docstrings

Probably the most common format for documenting arguments is reST field
lists [1]. This change updates some docstrings to comply with the field
lists syntax.

[1] http://sphinx-doc.org/domains.html#info-field-lists

Change-Id: I6b783d7c92852d656586e30d2456218436d1a015

tricircle/api/controllers/job.py

@@ -250,7 +250,7 @@ class AsyncJobController(rest.RestController):
         """Return a dictionary of query param filters from the request.
 
         :param params: the URI params coming from the wsgi layer
-        :return (flag, filters), flag indicates whether the filters are valid,
+        :return: (flag, filters), flag indicates whether the filters are valid,
         and the filters denote a list of key-value pairs.
         """
         filters = {}

tricircle/api/controllers/routing.py

@@ -91,7 +91,7 @@ class RoutingController(rest.RestController):
         """Return a dictionary of query param filters from the request.
 
         :param params: the URI params coming from the wsgi layer
-        :return (flag, filters), flag indicates whether the filters are valid,
+        :return: (flag, filters), flag indicates whether the filters are valid,
         and the filters denote a list of key-value pairs.
         """
         filters = {}