Update concurrency-control.md (#2566)

apache · May 5, 2023 · 9699500 · 9699500
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diff --git a/content/zh-cn/docsv2.7/user/examples/concurrency-control.md b/content/zh-cn/docsv2.7/user/examples/concurrency-control.md
@@ -10,6 +10,7 @@ weight: 28
 
 
 ## 背景
+多种并发控制功能，帮助用户管理其应用程序和服务。
 
 ## 示例