Fix typos in Node docs.

Author: syrusakbary

docs/relay/nodes.rst

@@ -75,11 +75,11 @@ Accessing node types
 --------------------
 
 If we want to retrieve node instances from a ``global_id`` (scalar that identifies an instance by it's type name and id),
-we can simply do ``Node.get_node_from_global_id(global_id, contet, info)``.
+we can simply do ``Node.get_node_from_global_id(global_id, context, info)``.
 
-In the case we want to restric the instnance retrieval to an specific type, we can do:
-``Node.get_node_from_global_id(global_id, contet, info, only_type=Ship)``. This will raise an error
-if the global_id doesn't correspond to a Ship type.
+In the case we want to restrict the instnance retrieval to an specific type, we can do:
+``Node.get_node_from_global_id(global_id, context, info, only_type=Ship)``. This will raise an error
+if the ``global_id`` doesn't correspond to a Ship type.
 
 
 Node Root field