Generally consider avoiding `!` punctuation from banners

_Originally posted by @chalin in https://github.com/open-telemetry/opentelemetry.io/pull/9747#discussion_r3142419363_ > @tiffany76 - for example, this is a typical CNCF banner now: > > > <img width="723" height="269" alt="image" src="https://github.com/user-attachments/assets/f87ed428-53d9-4305-9c1c-5bb2b5242dc1" /> > > Note the lack of emojis and affirmative punctuation :) Thoughts?