docs: Fix typo in docstring. (#2656)

Author: cqc-alec

hugr-py/src/hugr/hugr/base.py

@@ -633,7 +633,7 @@ def num_in_ports(self, node: ToNode) -> int:
     def num_out_ports(self, node: ToNode) -> int:
         """The number of outgoing ports of a node. See :meth:`num_ports`.
 
-        This value cound does not include order ports.
+        This value does not include order ports.
         """
         return self[node]._num_outs