fix typos (#138)

Author: zonca

Rethinking_2/Chp_02.ipynb

@@ -167,7 +167,7 @@
    "source": [
     "#### Code 2.6\n",
     "\n",
-    "Computing the posterior using the quadratic aproximation (quad)."
+    "Computing the posterior using the quadratic approximation (quad)."
    ]
   },
   {
@@ -213,7 +213,7 @@
    ],
    "source": [
     "data = np.repeat((0, 1), (3, 6))\n",
-    "with pm.Model() as normal_aproximation:\n",
+    "with pm.Model() as normal_approximation:\n",
     "    p = pm.Uniform(\"p\", 0, 1)  # uniform priors\n",
     "    w = pm.Binomial(\"w\", n=len(data), p=p, observed=data.sum())  # binomial likelihood\n",
     "    mean_q = pm.find_MAP()\n",
@@ -347,7 +347,7 @@
     "\n",
     "for idx, ps in enumerate(zip(w, n)):\n",
     "    data = np.repeat((0, 1), (ps[1] - ps[0], ps[0]))\n",
-    "    with pm.Model() as normal_aproximation:\n",
+    "    with pm.Model() as normal_approximation:\n",
     "        p = pm.Uniform(\"p\", 0, 1)  # uniform priors\n",
     "        w = pm.Binomial(\"w\", n=len(data), p=p, observed=data.sum())  # binomial likelihood\n",
     "        mean_q = pm.find_MAP()\n",
@@ -472,4 +472,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 1
-}
+}