Syntax error fix

Fix erroneous quotation marks in class attribute binding

src/views/megamenu/MegaMenuDoc.vue

@@ -171,7 +171,7 @@ export default {
 <MegaMenu :model="items">
     <template #item="{item}">
         <router-link :to="item.to" custom v-slot="{href, route, navigate, isActive, isExactActive}">
-            <a :href="href" @click="navigate" :class="{'active-link': isActive, 'active-link-exact": isExactActive}>{{route.fullPath}}</a>
+            <a :href="href" @click="navigate" :class="{'active-link': isActive, 'active-link-exact': isExactActive}">{{route.fullPath}}</a>
         </router-link>
     </template>
 </MegaMenu>
@@ -739,4 +739,4 @@ export default {
         }
     }
 }
-</script>
+</script>