Issue 87 in svnbook: ch06: mention 'htdigest' tool when mentioning digest auth

[svnbook at googlecode.com]

Updates:
	Status: Fixed

Comment #26 on issue 87 by cmpil... at gmail.com: ch06: mention 'htdigest'  
tool when mentioning digest auth
http://code.google.com/p/svnbook/issues/detail?id=87

    Sending        book/ch06-server-configuration.xml
    Transmitting file data .
    Committed revision 3921.

By George, I think we're done here.  Thanks for your patch and (more  
importantly) your patience, Quinn.