update example syntax

examples/injection_examples/basic_tutorial.py

examples/injection_examples/change_sampled_parameters.py

examples/injection_examples/create_your_own_source_model.py

...tion_examples/create_your_own_time_domain_source_model.py

examples/injection_examples/eccentric_inspiral.py

examples/injection_examples/how_to_specify_the_prior.py

examples/injection_examples/marginalized_likelihood.py

examples/injection_examples/plot_time_domain_data.py

examples/injection_examples/sine_gaussian_example.py

examples/supernova_example/supernova_example.py