Fix typo

Author: sjp

Chapter1_Introduction/Chapter1_Introduction.ipynb

@@ -118,7 +118,7 @@
       "\n",
       "**No.**\n",
       "\n",
-      "Frequentist methods are still useful or state-of-the-art in many areas. Tools like Least Squares linear regression, LASSO regression, EM algorithm etc. are all very powerful and incredibly fast. Bayesian methods are a compliment to solve the problems these solutions cannot or to gain further insight into the underlying system by offering more flexibility in modeling.\n",
+      "Frequentist methods are still useful or state-of-the-art in many areas. Tools like Least Squares linear regression, LASSO regression, EM algorithm etc. are all very powerful and incredibly fast. Bayesian methods are a complement to solve the problems these solutions cannot or to gain further insight into the underlying system by offering more flexibility in modeling.\n",
       "\n",
       "\n",
       "#### A note on *Big Data*\n",