Fix incorrect anchor in 2.13 release notes

Change-Id: If4065589a17e150384a559bcefc893b02320195c
diff --git a/releases/2.13.md b/releases/2.13.md
index 481a9fd..4581b82 100644
--- a/releases/2.13.md
+++ b/releases/2.13.md
@@ -454,7 +454,7 @@
 
 ## Bugfix Releases
 
-### 2.13.3 {#2.12.3}
+### 2.13.3 {#2.13.3}
 
 * [Issue 4633](https://bugs.chromium.org/p/gerrit/issues/detail?id=4633):
 Filter out unrelated projects when getting project watches from index.