quantity.Discrete.l2norm: minor change in comments

+quantity/Discrete.m

@@ -1916,7 +1916,8 @@ classdef  (InferiorClasses = {?quantity.Symbolic}) Discrete ...
 		
 		function xNorm = l2norm(obj, integrationDomain, optArg)
 			% l2norm calculates the l2 norm
-			%	xNorm = sqrt(int x.' * weight * x ddomain).
+			%	xNorm = sqrt(int(x.' * weight * x ddomain)). The integral is defined from the upper
+			%	and lower bound of the respective domain.
 			%
 			%	xNorm = l2norm(x) returns sqrt(int x.' * x ddomain), while the integral is
 			%	performed over every domain