Fix typo in index.html (#334)

Author: Jaseemck

boston-housing/index.html

@@ -65,7 +65,7 @@ <h1>Multivariate Regression</h1>
         in the area of Boston Massachusetts.
       </p>
       <p>
-        It allows you to compare the perfomance of 3 different models for predicting the house prices. When training
+        It allows you to compare the performance of 3 different models for predicting the house prices. When training
         the linear model, it will also display the largest 5 weights (by absolute value) of the model and
         the feature associated with each of those weights.
       </p>