Fix doc typos

src/peakrdl_regblock/utils.py

@@ -49,6 +49,8 @@ def ref_is_internal(top_node: AddrmapNode, ref: Union[Node, PropertyReference])
         current_node = ref
     elif isinstance(ref, PropertyReference):
         current_node = ref.node
+    else:
+        raise RuntimeError
 
     while current_node is not None:
         if current_node == top_node:
@@ -63,7 +65,7 @@ def ref_is_internal(top_node: AddrmapNode, ref: Union[Node, PropertyReference])
         current_node = current_node.parent
 
     # A root signal was referenced, which dodged the top addrmap
-    # This is considerd internal for this exporter
+    # This is considered internal for this exporter
     return True