Fix typos.

tutorial/tutorial.html

@@ -39,7 +39,7 @@ Shigeru Chiba
 Java bytecode is stored in a binary file called a class file.
 Each class file contains one Java class or interface.
 
-<p>The class <code>Javassist.CtClass</code> is an absatract
+<p>The class <code>Javassist.CtClass</code> is an abstract
 representation of a class file.  A <code>CtClass</code> (compile-time
 class) object is a handle for dealing with a class file.  The
 following program is a very simple example:
@@ -67,7 +67,7 @@ In the case of the program shown above, the
 <code>test.Rectangle</code> is obtained from the
 <code>ClassPool</code> object and it is assigned to a variable
 <code>cc</code>.
-The <code>ClassPool</code> object returned by <code>getDfault()</code>
+The <code>ClassPool</code> object returned by <code>getDefault()</code>
 searches the default system search path.
 
 <p>From the implementation viewpoint, <code>ClassPool</code> is a hash