Add default_db in the example config

I only found it in the docs after setting up per module db_

diff --git a/ejabberd.yml.example b/ejabberd.yml.example
index c6aef8fc3773bc5ae0e47c72d7318930628436b2..792a1788fb31ea457a1a5ae0a259c3003d5dacd2 100644 (file)
--- a/ejabberd.yml.example
+++ b/ejabberd.yml.example
@@ -442,6 +442,14 @@ auth_method: internal
 ##
 ## new_sql_schema: true
 
+##
+## A database can also can be used to store information from several
+## modules. To enable storage to the database, just make sure it is 
+## setup above and set default_db: sql if you want to use SQL for
+## all modules.
+##
+## default_db: sql
+
 ###.  ===============
 ###'  TRAFFIC SHAPERS