Explanation about `use_default_location`

[larsmw]

I was having troubles adding a ressource:location for my / path. I got an error about duplicate fragments that was not easy to get the meaning of. Finally I found this issue describing the problem : #982

When I added the / location section it could not be processed because there already was a hidden default for that path. When i added use_default_location => false into the server section I could overwrite the / handler. It could be nice with a few lines of description about this in the doc page.

[plantroon]

I also ran into this and using use_default_location = false helped. It does not seem very logical/straight-forward.