updated iota to theta_jn in tutorials
Updates the parameter representing angle between angular momentum and line of sight from 'iota' to 'theta_jn'. This brings the tutorial's parameter naming conventions up to date with the rest of the code.
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Updates the parameter representing angle between angular momentum and line of sight from 'iota' to 'theta_jn'. This brings the tutorial's parameter naming conventions up to date with the rest of the code.