Corrects a typo found by typos [1]

[1] https://github.com/crate-ci/typos

Author: dupgit

tests/TreeTopologyTest.py

@@ -527,7 +527,7 @@ def testWildcardsUnresolvedRouters(self):
                            '- Controller-vm[2,30]\n'
             self.assertEqual(str(tree), display_ref1)
 
-    def testWildcardsUnresolvedDestionation(self):
+    def testWildcardsUnresolvedDestination(self):
         """test topology with node groups and wildcards (unresolved dest)"""
         with NamedTemporaryFile() as tmpfile:
             tmpfile.write(b'[routes]\n')