v.split manual: improve section title

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@73786 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.split/v.split.html

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-co<h2>DESCRIPTION</h2>
+<h2>DESCRIPTION</h2>
 
 <em>v.split</em> splits vector lines into shorter segments using 
 a maximal distance between nodes. The resulting length of all segments