Fix typo in recipe name

Recipe's name was erroneously linked as multi-master rather than
dual-master

Bug: Issue 13059
Change-Id: Ide1e11fb0c2a3d7c2593b848448c471ea5248ed7
diff --git a/README.md b/README.md
index fcf18cc..6f3bd67 100644
--- a/README.md
+++ b/README.md
@@ -35,4 +35,4 @@
 
 * [Standalone Gerrit master sandbox with LDAP authentication](/single-master/README.md)
 * [Gerrit master and slave sandbox with LDAP authentication](/master-slave/README.md)
-* [Gerrit dual-master in HA sandbox with LDAP authentication](/multi-master/README.md)
+* [Gerrit dual-master in HA sandbox with LDAP authentication](/dual-master/README.md)