[clang] [clang] Enable descriptions for --print-supported-extensions (PR #66715)

[Balint Cristian via cfe-commits]

cbalint13 wrote:

@DavidSpickett ,

> Looks good to me, thanks for working on this.

Thank you very much for the time !

> I'm not sure if you'll have permissions to click the merge button but if you do, go ahead. 

* No, don't, I am outside contributor.

>Please remember to edit the  final commit message to remove the links to the output files.

* Done.






https://github.com/llvm/llvm-project/pull/66715