2.16: Reword section about schema upgrade

Reported-by: Jonathan Nieder <jrn@google.com>
Change-Id: Ic387d92457a27efb3ae89fb2ab99c70234637864
diff --git a/pages/site/releases/2.16.md b/pages/site/releases/2.16.md
index d54e2e3..bdbb579 100644
--- a/pages/site/releases/2.16.md
+++ b/pages/site/releases/2.16.md
@@ -33,9 +33,9 @@
 ### Known problem with schema upgrade
 
 When a gerrit site older than 2.15 is migrated to 2.16, then schema
-migration should be first performed to the latest 2.15 release.
+migration should be first performed to the latest 2.15.x release.
 
-To upgrade to 2.15 latest release:
+To upgrade to the latest 2.15.x release:
 
 ``` sh
   java -jar gerrit-2.15.latest.war init -d ${site_path}