Shorten width of documentation `examples`

[bschilder]

 Rd file 'TWT.Rd':
    \examples lines wider than 100 characters:
       coefficient_matrix<-ThreeWayTest::approximate_distribution_coefficient_estimate_T3(null_distribution)

  Rd file 'T_3.Rd':
    \examples lines wider than 100 characters:
       coefficient_matrix<-ThreeWayTest::approximate_distribution_coefficient_estimate_T3(null_distribution)

Easy fix, just add newlines to make the line widths <80 characters. Helps readability. Did the same for all Roxygen notes.