fix typo in figure file name

...gression_multiple_testing/figures/mtjoke_1+jellyBeans.png

...egression_multiple_testing/figures/mtjoke_2+rectangle.png

...sciences_regression_multiple_testing/figures/mtjoke_2.png

...gression_multiple_testing/figures/mtjoke_2b+rectangle.png

...ciences_regression_multiple_testing/figures/mtjoke_2b.png

...sciences_regression_multiple_testing/figures/mtjoke_3.png