[ci skip] Merge pull request #5265 from mehdibo/patch-1

Fixed dbprefix() documentation
diff --git a/user_guide_src/source/database/queries.rst b/user_guide_src/source/database/queries.rst
index f626f1e..710abab 100644
--- a/user_guide_src/source/database/queries.rst
+++ b/user_guide_src/source/database/queries.rst
@@ -66,7 +66,7 @@
 If for any reason you would like to change the prefix programatically
 without needing to create a new connection, you can use this method::
 
-	$this->db->set_dbprefix('newprefix');
+	$this->db->set_dbprefix('newprefix_');
 	$this->db->dbprefix('tablename'); // outputs newprefix_tablename