Updated the introduction

doc/pub/How2ReadData/html/How2ReadData.html

@@ -409,7 +409,7 @@ factor in front of \( x \) and the normal distribution.  Try to change the
 function \( y \) to
 
 $$
-y = 10x+0.01N(0,1),
+y = 10x+0.01 \times N(0,1),
 $$
 
 <p>
@@ -421,7 +421,7 @@ long run. Here we have only defined the training data and our model, and
 have not discussed a more rigorous approach to the <b>cost</b> function.
 
 <p>
-We need more rigorous criteria in defining whether we have succeed or
+We need more rigorous criteria in defining whether we have succeeded or
 not in modeling our training data.  You will be surprised to see that
 many scientists seldomly venture beyond this 'by the eye' approach. A
 standard approach for the <em>cost</em> function is the so-called \( \chi^2 \)