Update v3.0/releases/21rc5.md

Co-Authored-By: Keke Yi <40977455+yikeke@users.noreply.github.com>
shawn0915 · Nov 1, 2019 · 9297a66 · 9297a66
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diff --git a/v3.0/releases/21rc5.md b/v3.0/releases/21rc5.md
@@ -62,4 +62,4 @@ aliases: ['/docs-cn/releases/21rc5/']
 
 ## Tools
 
-- TiDB 支持 TiDB Binlog cluster，不兼容旧版本 TiDB Binlog [#8093](https://github.com/pingcap/tidb/pull/8093)，[使用文档](https://pingcap.com/docs-cn/v3.0/reference/tools/tidb-binlog/overview/)
+- TiDB 支持 TiDB Binlog cluster，不兼容旧版本 TiDB Binlog [#8093](https://github.com/pingcap/tidb/pull/8093)，[使用文档](/v3.0/reference/tools/tidb-binlog/overview/)