doc for strmult

Rev: doc/simulated/strmult:1.1

doc/simulated/strmult

+NAME
+	strmult - multiply strings
+
+SYNTAX
+	#include <string.h>
+
+	string strmult(string s, int num);
+
+DESCRIPTION
+	This function multplies 's' by 'num'. The return value is the same
+	as appending 's' to an empty string 'num' times.