bug#61697: Chromium with guix shell container from the manual doesn't work.

[address@hidden]

The problem was that in xorg you need the specific option:

```

--share=/tmp

```

So the command would look like:

```

guix shell --container --network --share=/tmp --no-cwd icecat 
--preserve='^DISPLAY$' -- icecat

```


While in wayland it works as is.

Next step would be documenting this in the manual.