Update loadbalance.md (#773)

diff --git a/content/zh/docs/v2.7/dev/source/loadbalance.md b/content/zh/docs/v2.7/dev/source/loadbalance.md
index 62c1b6c..eb49965 100644
--- a/content/zh/docs/v2.7/dev/source/loadbalance.md
+++ b/content/zh/docs/v2.7/dev/source/loadbalance.md
@@ -3,7 +3,7 @@
 title: "负载均衡"
 linkTitle: "负载均衡"
 weight: 8
-description: "本文介绍了集群的原理和实现细节"
+description: "本文介绍了负载均衡的原理和实现细节"
 ---