[hotfix][docs] Use stable fluss doc link to avoid link broken once fluss community version bump

Author: leonardBang

docs/content.zh/docs/dev/table/tuning.md

@@ -299,7 +299,7 @@ ON a.id = b.id
 该功能默认启用。当满足以下所有条件时， regular join 将自动优化为 delta join。
 
 1. 作业拓扑结构满足优化条件。具体可以查看[支持的功能和限制]({{< ref "docs/dev/table/tuning" >}}#supported-features-and-limitations)。
-2. 源表所在的外部存储系统提供了可供 delta join 快速查询的索引信息。目前 [Apache Fluss(Incubating)](https://fluss.apache.org/blog/fluss-open-source/) 已支持在 Flink 中提供表级别的索引信息，其上的表可作为 delta join 的源表。具体可参考 [Fluss 文档](https://fluss.apache.org/docs/0.8/engine-flink/delta-joins/#flink-version-support)。
+2. 源表所在的外部存储系统提供了可供 delta join 快速查询的索引信息。目前 [Apache Fluss(Incubating)](https://fluss.apache.org/blog/fluss-open-source/) 已支持在 Flink 中提供表级别的索引信息，其上的表可作为 delta join 的源表。具体可参考 [Fluss 文档](https://fluss.apache.org/docs/engine-flink/delta-joins/#flink-version-support)。
 
 ### 工作原理
 

docs/content/docs/dev/table/tuning.md

@@ -395,7 +395,7 @@ To mitigate these challenges, Flink introduces the delta join operator. The key
 This feature is enabled by default. A regular join will be automatically optimized into a delta join when all the following conditions are met:
 
 1. The sql pattern satisfies the optimization criteria. For details, please refer to [Supported Features and Limitations]({{< ref "docs/dev/table/tuning" >}}#supported-features-and-limitations)
-2. The external storage system of the source table provides index information for fast querying for delta joins. Currently, [Apache Fluss(Incubating)](https://fluss.apache.org/blog/fluss-open-source/) has provided index information at the table level for Flink, allowing such tables to be used as source tables for delta joins. Please refer to the [Fluss documentation](https://fluss.apache.org/docs/0.8/engine-flink/delta-joins/#flink-version-support) for more details.
+2. The external storage system of the source table provides index information for fast querying for delta joins. Currently, [Apache Fluss(Incubating)](https://fluss.apache.org/blog/fluss-open-source/) has provided index information at the table level for Flink, allowing such tables to be used as source tables for delta joins. Please refer to the [Fluss documentation](https://fluss.apache.org/docs/engine-flink/delta-joins/#flink-version-support) for more details.
 
 ### Working Principle