wscalls: unflatten payload when calling webservice (#66916)

wcs/wf/wscall.py

@@ -308,10 +308,10 @@ class WebserviceCallStatusItem(WorkflowStatusItem):
                     'The / in parameter name allows to generate complex objects. '
                     'Thus a parameter named "element/child" containing "value" will generate the payload '
                     '"element": {"child": "value"}. If the subkey, i.e. "child", is an integer it will '
-                    'become a list index and two elements "element/0", "element/1" containing "value1" '
-                    'and "value2" will generate the payload "element": ["value1", "value2"]. '
-                    'It is possible to combine the two types, for example "element/0/key1" to generate '
-                    'a list of objects.'
+                    'become a list index and two elements "element/0", "element/1" (indexes should '
+                    ' start from zero) containing "value1" and "value2" will generate the payload '
+                    '"element": ["value1", "value2"]. It is possible to combine the two types, for '
+                    'example "element/0/key1" to generate a list of objects.'
                 ),
             )
 

wcs/wscalls.py

@@ -499,10 +499,10 @@ class WsCallRequestWidget(CompositeWidget):
                 'The / in parameter name allows to generate complex objects. '
                 'Thus a parameter named "element/child" containing "value" will generate the payload '
                 '"element": {"child": "value"}. If the subkey, i.e. "child", is an integer it will '
-                'become a list index and two elements "element/0", "element/1" containing "value1" '
-                'and "value2" will generate the payload "element": ["value1", "value2"]. '
-                'It is possible to combine the two types, for example "element/0/key1" to generate '
-                'a list of objects.'
+                'become a list index and two elements "element/0", "element/1" (indexes should '
+                ' start from zero) containing "value1" and "value2" will generate the payload '
+                '"element": ["value1", "value2"]. It is possible to combine the two types, for '
+                'example "element/0/key1" to generate a list of objects.'
             ),
         )