Fix typo in function signature

Author: rocky

pymathics/graph/__init__.py

@@ -21,7 +21,7 @@
     = -Graph-
 
    >> ConnectedComponents[g]
-    = {{3, 4}, {2}, {1}}
+    = {{4, 3}, {2}, {1}}
 
    >> WeaklyConnectedComponents[g]
     = {{1, 2, 3, 4}}

pymathics/graph/properties.py

@@ -436,7 +436,7 @@ class SimpleGraphQ(_NetworkXBuiltin):
     summary_text = "test if a graph is simple (not multigraph)"
 
     def eval(self, graph, expression, evaluation, options):
-        "LoopFreeGraphQ[graph_, OptionsPattern[LoopFreeGraphQ]]"
+        "SimpleGraphQ[graph_, OptionsPattern[LoopFreeGraphQ]]"
         graph = self._build_graph(graph, evaluation, options, expression, quiet=True)
         if graph:
             if graph.empty():