v.out.ogr manual: mention 10 chars colnames limit for DBF

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@63791 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.out.ogr/v.out.ogr.html

@@ -54,9 +54,13 @@ the same category. When <b>-c</b> flag is given, the module also
 export GRASS features without category as one multi-feature. Note that
 multi-features are not supported by all formats.
 
+<p>
+ESRI Shapefile export: note that due to the DBF table specifications
+column names may not be longer than 10 characters.
+
 <h2>EXAMPLES</h2>
 
-<h3>Export to Esri Shapefile</h3>
+<h3>Export to ESRI Shapefile</h3>
 
 Export lines from GRASS vector map to Shapefile format: