Merge pull request #33 from Ipsit1234/graph_object_with_node_features…

…_intro_doc

fixed syntax error occured while importing ```deepsnap.graph.Graph```

docs/source/notes/introduction.rst

@@ -91,7 +91,7 @@ attribute name :attr:`node_feature`.
     
     import torch
     import networkx as nx
-    rom deepsnap.graph import Graph
+    from deepsnap.graph import Graph
 
     G = nx.Graph()
     G.add_node(0, node_feature=torch.tensor([1,2,3]))