Misc minor doc updates.

diff --git a/xmldoc/filters/options/discard-sat.xml b/xmldoc/filters/options/discard-sat.xml
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+++ b/xmldoc/filters/options/discard-sat.xml
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+<para>
+This option specifies the minimum required number of satelites.
+</para>
+

diff --git a/xmldoc/formats/options/kml-trackdirection.xml b/xmldoc/formats/options/kml-trackdirection.xml
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+++ b/xmldoc/formats/options/kml-trackdirection.xml
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+<para>
+  If set, this options creates directional icons for trackpoints.   Arrows 
+  will show the direction of travel on drawn tracks and routes.
+</para>

diff --git a/xmldoc/formats/options/mtk-bin-csv.xml b/xmldoc/formats/options/mtk-bin-csv.xml
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+++ b/xmldoc/formats/options/mtk-bin-csv.xml
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+<para>
+  Specifies a filename into which  MTK-compatible CSV output will be written.
+</para>
+<para>
+  Note that this option is a bit of an oddity in the GPSBabel arsenal.  This
+  should probably be a "real" output type of its own instead of being bolted
+  onto an input type.
+</para>