Fixed LaTeX issue in binomial GLM notebook

Author: fonnesbeck

docs/source/notebooks/GLM-hierarchical-binominal-model.ipynb

@@ -210,10 +210,10 @@
    "source": [
     "The plot shows that the posterior is roughly symetric about the mode (-1.79, 2.74).  This corresponds to $\\alpha = 2.21$ and $\\beta = 13.27$. We can compute the marginal means as the authors of BDA3 do, using\n",
     "\n",
-    "$$ \\operatorname{E}(\\alpha \\lvert y) \\mbox{   is Estimated By   }\n",
+    "$$ \\operatorname{E}(\\alpha \\lvert y) \\text{   is estimated by   }\n",
     "\\sum_{x,z} \\alpha p(x,z\\lvert y) $$\n",
     "\n",
-    "$$ \\operatorname{E}(\\beta \\lvert y) \\mbox{   is Estimated By   }\n",
+    "$$ \\operatorname{E}(\\beta \\lvert y) \\text{   is estimated by   }\n",
     "\\sum_{x,z} \\beta p(x,z\\lvert y) $$"
    ]
   },