Fix markdown in 2.13 release notes

Change-Id: I11a290cbbb9dd8f9a6b3a12c2e7626bbfce8d86e

releases/2.13.md

diff --git a/releases/2.13.md b/releases/2.13.md
index 520b2a2..8806b86 100644
--- a/releases/2.13.md
+++ b/releases/2.13.md
@@ -5,7 +5,7 @@
 | [2.13.1](https://gerrit-releases.storage.googleapis.com/gerrit-2.13.1.war)
 | [2.13](https://gerrit-releases.storage.googleapis.com/gerrit-2.13.war)
 
-Documentation: [2.13.3](https://gerrit-documentation.storage.googleapis.com/Documentation/2.13.3/index.html)**
+Documentation: **[2.13.3](https://gerrit-documentation.storage.googleapis.com/Documentation/2.13.3/index.html)**
 | [2.13.2](https://gerrit-documentation.storage.googleapis.com/Documentation/2.13.2/index.html)
 | [2.13.1](https://gerrit-documentation.storage.googleapis.com/Documentation/2.13.1/index.html)
 | [2.13](https://gerrit-documentation.storage.googleapis.com/Documentation/2.13/index.html)