fix(admin): 移除上传提示中的并发表述

上传为异步队列，文件数量不设上限，提示只保留格式与单文件大小限制

src/locales/en.ts

@@ -537,7 +537,7 @@ export default {
     retry: 'Retry',
     retryAll: 'Retry all',
     remove: 'Remove',
-    hint: 'Supports MP4 / MOV / MKV / WEBM, max 500MB each; multi-select allowed, 2 upload in parallel, the rest queue automatically.',
+    hint: 'Supports MP4 / MOV / MKV / WEBM, max 500MB each',
     invalidType: 'Only MP4, MOV, MKV, WEBM are allowed',
     oversize: 'File exceeds 500MB and was not queued',
     overallProgress: 'Overall progress',