v.rast.stats: update param description completing https://trac.osgeo.org/grass/changeset/58735

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@64556 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/v.rast.stats/v.rast.stats.py

@@ -55,7 +55,7 @@
 #%option
 #% key: percentile
 #% type: integer
-#% description: Percentile to calculate (requires extended statistics flag)
+#% description: Percentile to calculate
 #% options: 0-100
 #% answer: 90
 #% required : no