xgboost_direct_marketing fix grammar

Predicting those potential customer's

should be

Predicting those potential customers

Author: zdwolfe

introduction_to_applying_machine_learning/xgboost_direct_marketing/xgboost_direct_marketing_sagemaker.ipynb

@@ -26,7 +26,7 @@
     "---\n",
     "\n",
     "## Background\n",
-    "Direct marketing, either through mail, email, phone, etc., is a common tactic to acquire customers.  Because resources and a customer's attention is limited, the goal is to only target the subset of prospects who are likely to engage with a specific offer.  Predicting those potential customer's based on readily available information like demographics, past interactions, and environmental factors is a common machine learning problem.\n",
+    "Direct marketing, either through mail, email, phone, etc., is a common tactic to acquire customers.  Because resources and a customer's attention is limited, the goal is to only target the subset of prospects who are likely to engage with a specific offer.  Predicting those potential customers based on readily available information like demographics, past interactions, and environmental factors is a common machine learning problem.\n",
     "\n",
     "This notebook presents an example problem to predict if a customer will enroll for a term deposit at a bank, after one or more phone calls.  The steps include:\n",
     "\n",