[llvm] [llvm][Docs] add discord bot calendar capability notes (PR #122140)

[Aaron Ballman via llvm-commits]

https://github.com/AaronBallman approved this pull request.

Thank you for working on this! I think it looks good, but please wait a bit before landing in case anyone else has feedback.

https://github.com/llvm/llvm-project/pull/122140