Document DG100's erase_only flag.

git-svn-id: http://gpsbabel.googlecode.com/svn/trunk@3815 f51c46e8-681c-474f-0cfe-069cfd0219fb

diff --git a/gpsbabel/xmldoc/formats/options/dg-100-erase_only.xml b/gpsbabel/xmldoc/formats/options/dg-100-erase_only.xml
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+<para>
+  Much like the <option>erase</option> this optio erases the data in the GPS.
+  It does not transfer data before doing so, making it much faster.  This may
+  be handy in a work flow where you want to transfer the data from the GPS,
+  check it on a map, and then remove it from the unit.
+</para>