Indicate difference to non oss version in description

[FlorianLudwig]

The packages com.visualstudio.code.oss and com.visualstudio.code have the exact same description, please include a note explaining the difference of the two packages.

[TingPing]

Difference was described here: https://github.com/flathub/com.visualstudio.code.oss/issues/6

If somebody wants to add that to the description.

[amtlib-dot-dll]

I'll add when I have time. Or you can submit a PR @FlorianLudwig 🤣

[nedrichards]

I've added a small explanation to the proprietary version. I'd prefer to try and keep this as close to unmodified upstream as possible.

[FlorianLudwig]

@nedrichards thanks!