Fix model graph node name to remove RV from end only and not the start

Author: cscheffler

pymc/model_graph.py

@@ -135,8 +135,10 @@ def _make_node(self, var_name, graph, *, formatting: str = "plain"):
                 style = "filled"
             else:
                 shape = "ellipse"
-                syle = None
-            symbol = v.owner.op.__class__.__name__.strip("RV")
+                style = None
+            symbol = v.owner.op.__class__.__name__
+            if symbol.endswith("RV"):
+                symbol = symbol[:-2]
             label = f"{var_name}\n~\n{symbol}"
         else:
             shape = "box"