Add download and documentation links for 2.15.12

Change-Id: I4eeed481b1716c8a670a91f014bec6ff8d377d1c
diff --git a/pages/site/releases/2.15.md b/pages/site/releases/2.15.md
index fa32f1c..3d72313 100644
--- a/pages/site/releases/2.15.md
+++ b/pages/site/releases/2.15.md
@@ -6,7 +6,8 @@
 toc: true
 ---
 
-Download: **[2.15.11](https://gerrit-releases.storage.googleapis.com/gerrit-2.15.11.war)**
+Download: **[2.15.12](https://gerrit-releases.storage.googleapis.com/gerrit-2.15.12.war)**
+| [2.15.11](https://gerrit-releases.storage.googleapis.com/gerrit-2.15.11.war)
 | [2.15.10](https://gerrit-releases.storage.googleapis.com/gerrit-2.15.10.war)
 | [2.15.9](https://gerrit-releases.storage.googleapis.com/gerrit-2.15.9.war)
 | [2.15.8](https://gerrit-releases.storage.googleapis.com/gerrit-2.15.8.war)
@@ -19,7 +20,8 @@
 | [2.15.1](https://gerrit-releases.storage.googleapis.com/gerrit-2.15.1.war)
 | [2.15](https://gerrit-releases.storage.googleapis.com/gerrit-2.15.war)
 
-Documentation: **[2.15.11](https://gerrit-documentation.storage.googleapis.com/Documentation/2.15.11/index.html)**
+Documentation: **[2.15.12](https://gerrit-documentation.storage.googleapis.com/Documentation/2.15.12/index.html)**
+| [2.15.11](https://gerrit-documentation.storage.googleapis.com/Documentation/2.15.11/index.html)
 | [2.15.10](https://gerrit-documentation.storage.googleapis.com/Documentation/2.15.10/index.html)
 | [2.15.9](https://gerrit-documentation.storage.googleapis.com/Documentation/2.15.9/index.html)
 | [2.15.8](https://gerrit-documentation.storage.googleapis.com/Documentation/2.15.8/index.html)