PL -- I noticed the same thing. Since I am conducting the Fibo tutorial for the 73rd time (because it does not work for me) I am being very careful to follow the directions EXACTLY.
In your case I found that I needed to select the CLASS (...Go to the top of the class and...) -- not the java-object.
once the class is selected, you can edit in the code-window as follows...
1) on the line immediately above a method-line (say Public void ejbActivate(..etc..)) type in /* followed by . You will see the correct tag inserted in comment-form -- as shown in the tutorial on page 10,11,12.
I have a different problem -- reported 1/27/06.
Hope this helps.