Fix typo

Author: robperc

introduction_to_amazon_algorithms/deepar_retail_forecasting/deepar_retail_forecasting.ipynb

@@ -332,7 +332,7 @@
     "\n",
     "n_products = 100 # Number of products to generate. Increase this to generate more individual product data\n",
     "\n",
-    "n_years = 4 # Number of years in past from current date to generate date for. Increase this to generate longer time series for each product\n",
+    "n_years = 4 # Number of years in past from current date to generate data for. Increase this to generate longer time series for each product\n",
     "\n",
     "products = [make_product(categories, n_years) for i in range(n_products)]\n",
     "\n",