[clang] Nominate Saleem and myself as maintainers for API Notes (PR #114981)

[Saleem Abdulrasool via cfe-commits]

compnerd wrote:

Thanks @AaronBallman - @egorzhdan was nice enough to reach out to me earlier and I am fine with co-maintaining the APINotes.

https://github.com/llvm/llvm-project/pull/114981