Re: [EXTERNAL] Re: Zink MR signoff tags

For simple MR without rb/ab is good, but for large MR, part of them are
reviewed, and part of are not.
I would suggest for large MR, the reviewed commits's title can styled with
for example:

```
xlib(ab): Some change acked of xlib
```

```
xlib(rb): Some change reviewed of xlib
```

For changes both with ab/rb, use rb