Merge pull request #4855 from sbkolate/patch-1

better validation example for developer

erpnext/docs/user/manual/en/customize-erpnext/custom-scripts/custom-script-examples/date-validation.md

@@ -1,10 +1,10 @@
 # Date Validation
 
 
-	frappe.ui.form.on("Event", "validate", function(frm) {
+	frappe.ui.form.on("Task", "validate", function(frm) {
         if (frm.doc.from_date < get_today()) {
             msgprint(__("You can not select past date in From Date"));
-            throw "past date selected"
+            validated = false;
         }
 	});