correction typo in help file

grass7/display/d.vect.colbp/d.vect.colbp.html

@@ -23,7 +23,7 @@ <h2>DESCRIPTION</h2>
 <h2>NOTE</h2>
 <p>
 This script, based on d.vect.colhist, is a quick and dirty solution 
-using basic matplotlib, and will need some further fine-tuning and 
+sing basic matplotlib, and will need some further fine-tuning and 
 testing.
 
 <h2>EXAMPLE</h2>