Fix typos reported by codespell

test/functional/example_test.py

@@ -76,7 +76,7 @@ class ExampleTest(BitcoinTestFramework):
     def set_test_params(self):
         """Override test parameters for your individual test.
 
-        This method must be overridden and num_nodes must be exlicitly set."""
+        This method must be overridden and num_nodes must be explicitly set."""
         self.setup_clean_chain = True
         self.num_nodes = 3
         # Use self.extra_args to change command-line arguments for the nodes