conditional sigmas in W3D1_Tutorial2

[Fernando J. Chaure]

Hi, on tutorials/W3D1_BayesianDecisions/W3D1_Tutorial2.ipynb
the lines 304 and 305, should be:

" sigma_x_y = np.sqrt(sigma12 * (1-corr2))\n",
" sigma_y_x = np.sqrt(sigma22 * (1-corr2))\n",

[Spiros Chavlis]

Thank you for reporting. #809 fixed this issue.