Add doc for unicsv option utc.

diff --git a/gpsbabel/xmldoc/formats/options/unicsv-utc.xml b/gpsbabel/xmldoc/formats/options/unicsv-utc.xml
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index 0000000..4c2964e
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+++ b/gpsbabel/xmldoc/formats/options/unicsv-utc.xml
@@ -0,0 +1,5 @@
+<para>
+This option specifies the local time zone to use when writing times.  It
+is specified as an offset from Universal Coordinated Time (UTC) in hours.  
+Valid values are from -23 to +23.
+</para>