New review comment by classabbyamp on void-packages repository

https://github.com/void-linux/void-packages/pull/45307#discussion_r1278309579

Comment:
```suggestion
exec 2>&1
[ -r ./conf ] && . ./conf
exec /usr/libexec/vncsession-start "${DISPLAY:-:1}"
```
the `./conf` convention allows users to customise the service by setting variables like this. For example, a user could add a `conf` file with the contents:
```sh
DISPLAY=":3"
```
if they wanted the vnc server to run on a different  `DISPLAY`