Remove *.out from svn:eol-style paragraph in docs environment instructions

The instructions on how to set up a docs environment - http://db.apache.org/derby/manuals/dita.html - say the following:

> Add these DITA file types to your configuration file:
>
> *.dita = svn:eol-style=native
> *.ditamap = svn:eol-style=native
> *.out = svn:eol-style=native

There are no files named *.out in the docs repository, so I think we could remove the last line.