Remove mention that H2 is not recommended for large installations

Since 2.16, most data is stored in NoteDB apart from one table.

So instead of wasting resources by having a mysql db we can 
convert to H2 for that single table.

But the documentation recommend against it for large installations.

Change-Id: I54e8ceb825292fd7b651f7d44deb594e2fc0ebc6
diff --git a/Documentation/database-setup.txt b/Documentation/database-setup.txt
index 2153751..de4fb20 100644
--- a/Documentation/database-setup.txt
+++ b/Documentation/database-setup.txt
@@ -12,7 +12,7 @@
 Using the embedded H2 database is the easiest way to get a Gerrit
 site up and running, making it ideal for proof of concepts or small team
 servers.  On the flip side, H2 is not the recommended option for large
-corporate installations. This is because there is no easy way to interact
+corporate installations when using ReviewDb. This is because there is no easy way to interact
 with the database while Gerrit is offline, it's not easy to backup the data,
 and it's not possible to set up H2 in a load balanced/hotswap configuration.