CH2: Correct Bernoulli failure probability

This was fixed in 3fe9939 but unrelated
changes in 16c6a77 reverted the fix.

Author: kyleam

Chapter2_MorePyMC/MorePyMC.ipynb

@@ -709,7 +709,7 @@
      "source": [
       "Had we had stronger beliefs, we could have expressed them in the prior above.\n",
       "\n",
-      "For this example, consider $p_A = 0.05$, and $N = 1500$ users shown site A, and we will simulate whether the user made a purchase or not. To simulate this from $N$ trials, we will use a *Bernoulli* distribution: if  $ X\\ \\sim \\text{Ber}(p)$, then $X$ is 1 with probability $p$ and 0 with probability $1$. Of course, in practice we do not know $p_A$, but we will use it here to simulate the data."
+      "For this example, consider $p_A = 0.05$, and $N = 1500$ users shown site A, and we will simulate whether the user made a purchase or not. To simulate this from $N$ trials, we will use a *Bernoulli* distribution: if  $ X\\ \\sim \\text{Ber}(p)$, then $X$ is 1 with probability $p$ and 0 with probability $1 - p$. Of course, in practice we do not know $p_A$, but we will use it here to simulate the data."
      ]
     },
     {