Rollup merge of #93899 - ssomers:vecdeque_naming, r=m-ou-se

Describe VecDeque with more consistent names

The public documentation of VecDeque starts describing itself as a "queue". In method descriptions, it's ~~never~~ sometimes named queue again, or `VecDeque` (IMO a sometimes useful and often noisy notation) or "deque" or "vector". In examples, `deque`, `v` (hidden in `range_mut`) or `vector`. Here is a subjective attempt at more consistency.