Merge pull request #406 from habibasorour/issue_401_error

Issue 401: fixed build warning

Author: pearcej

source/ch3_javadatatypes.ptx

@@ -7,6 +7,8 @@
     <section xml:id="numeric">
         <title>Numeric</title>
 
+        <subsection> 
+        <title>Primitive and Object Data Types</title>
             <p>
                 One of the great things about Python is that all of the basic data types are objects.
                 Integers are objects, floating point numbers are objects, lists are objects, everything.
@@ -156,7 +158,7 @@ public class TempConv {
 
                 </ul>
             </p>
-
+        </subsection>
 
         <subsection>
             <title>Import</title>