mmapstorage: update readme and update news
@@ -83,5 +83,4 @@ sudo kdb umount user/tests/mmapstorage
## Limitations
-Currently mapped files shall not be altered, otherwise the behaviour is undefined. Therefore we set an
-advisory lock with `flock()`, such that competing KDB instances can not overwrite mapped files.
+Currently mapped files shall not be altered, otherwise the behaviour is undefined.
