[clang] [Clang][AST][NFC] Correct Comment in GenericSelectionExpr (PR #180850)

[Corentin Jabot via cfe-commits]

cor3ntin wrote:

> Thank you so much for the feedback. I am still relatively new to LLVM -- now that you have approved the commit (and I rebase on main), is it okay for me to merge?

Yes - once the PR is approved and all reviewers seem happy, you can merge

https://github.com/llvm/llvm-project/pull/180850