add description for outstanding rewards

src/views/components/staking/StakingRewardComponent.vue

@@ -22,7 +22,11 @@
         :key="d.amount"
         class="transaction-item"
       >
-        <b-media no-body>
+        <b-media
+          v-b-tooltip.hover.top
+          title="Rewards of all delegators"
+          no-body
+        >
           <b-media-aside>
             <b-avatar
               rounded
@@ -95,7 +99,7 @@
 
 <script>
 import {
-  BCard, BCardHeader, BCardTitle, BCardBody, BMediaBody, BMedia, BMediaAside, BAvatar, BButton,
+  BCard, BCardHeader, BCardTitle, BCardBody, BMediaBody, BMedia, BMediaAside, BAvatar, BButton, VBTooltip,
 } from 'bootstrap-vue'
 import { formatToken, numberWithCommas } from '@/libs/utils'
 import OperationModal from '@/views/components/OperationModal/index.vue'
@@ -113,6 +117,9 @@ export default {
     BAvatar,
     OperationModal,
   },
+  directives: {
+    'b-tooltip': VBTooltip,
+  },
   props: {
     data: {
       type: Object,