/**
* Open a connection to the server given by the specified index
- * Index must be an actual index into the array.
- * If the server is already open, returns it.
+ *
+ * The index must be an actual index into the array. If a connection to the server is
+ * already open and not considered an "in use" foreign connection, this simply returns it.
*
* @note If disable() was called on this LoadBalancer, this method will throw a DBAccessError.
*
- * @param int $i Server index or DB_MASTER/DB_REPLICA
+ * @param int $i Server index (does not support DB_MASTER/DB_REPLICA)
* @param string|bool $domain Domain ID, or false for the current domain
* @return Database|bool Returns false on errors
* @throws DBAccessError