Form-item: fix typo

packages/form/src/form-item.vue

@@ -193,11 +193,11 @@
       },
       getRules() {
         var formRules = this.form.rules;
-        var selfRuels = this.rules;
+        var selfRules = this.rules;
 
         formRules = formRules ? formRules[this.prop] : [];
 
-        return [].concat(selfRuels || formRules || []);
+        return [].concat(selfRules || formRules || []);
       },
       getFilteredRule(trigger) {
         var rules = this.getRules();