Update zh/TOC.md

Co-authored-by: Aolin <aolinz@outlook.com>

Author: liubog2008

zh/TOC.md

@@ -60,5 +60,5 @@
     - [TiDB Toolkit](tidb-toolkit.md)
 - 版本发布历史
   - v2.0
+    - [2.0 GA](releases/release-2.0.0.md)
     - [2.0.0-beta.0](releases/release-2.0.0-beta.0.md)
-    - [2.0.0](releases/release-2.0.0.md)