[DOC BLD FIX] Fix docstring errors in Dell/EMC Unity

There were docstring errors in the Unity driver that were causing
sphinx to throw errors.  This patch fixes those errors.

Change-Id: I2d0f6375ecb6ed759dac59660e7e75c8befb6258

cinder/volume/drivers/dell_emc/unity/adapter.py

@@ -437,7 +437,9 @@ class CommonAdapter(object):
         .. code-block:: none
 
         existing_ref:{
+
             'source-id':<LUN id in Unity>
+
         }
 
         or
@@ -445,7 +447,9 @@ class CommonAdapter(object):
         .. code-block:: none
 
         existing_ref:{
+
             'source-name':<LUN name in Unity>
+
         }
         """
         lun = self._get_referenced_lun(existing_ref)

cinder/volume/drivers/dell_emc/unity/utils.py

@@ -144,13 +144,16 @@ def convert_to_itor_tgt_map(zone_mapping):
 
     :param zone_mapping: mapping is the data from the zone lookup service
          with below format
+
         {
              <San name>: {
                  'initiator_port_wwn_list':
                  ('200000051e55a100', '200000051e55a121'..)
                  'target_port_wwn_list':
                  ('100000051e55a100', '100000051e55a121'..)
+
              }
+
         }
     """
     target_wwns = []