Rephrase docs for Vec::drain to better clarify Drop behavior #39134
Description
(This is mostly for my own benefit as I've been separated from my Rust fork and associated development environment. If someone wants to pick this up, though, it's a wonderful first dive into documentation contributions! :3)
The "Note 1" on Vec::drain could be rephrased to be more clear. Something like "Note 1: The element range is removed even if the iterator is only partially consumed or not consumed at all." Some discussion in rust-beginners revealed some confusion around the current "is not consumed until the end" phrasing.