style: 修改广播帮助的数量提示

src/i18n/locales/en-US.ts

@@ -395,7 +395,7 @@ export default {
         createdAt:'Create Time',
         eventNameHelp:'If it is CMAS, the recommended prefix is cmas_xxx. If it is ETWS, the recommended prefix is etws_xxx',
         repetitionPeriodHelp:'Unit is seconds',
-        numOfBcastHelp:'Unit is seconds',
+        numOfBcastHelp:'Number of Broadcasts',
         cellListTip:'CellId List cannot be empty',
         cellListSonTip:'MCC、MNC、 Cannot be empty, and at least one EUTRA CellId/NR CellId must be filled in',
         letupSure:'Do you confirm the status of the broadcast event with the modification number 【{id}】?',