Slight doc change [skip ci]

Author: stefanradev93

bayesflow/summary_networks.py

@@ -583,7 +583,8 @@ def call(self, x, return_all=False, **kwargs):
         Returns
         -------
         out : tf.Tensor
-            Output of shape ``(batch_size, out_dim) if return_all=False`` else
+            Output of shape ``(batch_size, out_dim) if return_all=False`` else a tuple
+            of ``len(outputs) == len(networks)`` corresponding to all outputs of all networks.
         """
 
         if return_all: