fixed small typo in navigation_py docs pythong->python

docs/example_navigation_py.md

@@ -167,7 +167,7 @@ plt.show()
 <!--Direct Interface-->
 ```python
 # Note: to use the direct interface you need to build using
-#       .with_build_pythong_bindings()
+#       .with_build_python_bindings()
 import sys
 
 # Use Direct Interface