Issue 72 in svnbook: ch06: SSL certificate management explanation

[svnbook at googlecode.com]

Comment #3 on issue 72 by quinntay... at mac.com: ch06: SSL certificate  
management explanation
http://code.google.com/p/svnbook/issues/detail?id=72

Since I had already submitted some other changes to the SSL section,  
cmpilato asked me to integrate these improvements. He committed them in rev  
3890; I think the new version addresses this issue.