Rollup merge of #91383 - ScriptDevil:drop-while-doc-alias, r=joshtriplett
Rollup merge of #91383 - ScriptDevil:drop-while-doc-alias, r=joshtriplett

Add `drop_while` as doc alias to `Iterator::skip_while`

`skip_while` is commonly referred to as `drop_while` in other languages (clojure/c++/haskell). This recently came up in [Zulip](https://rust-lang.zulipchat.com/#narrow/stream/122651-general/topic/.E2.9C.94.20DropWhile/near/262203352) as well.

This pull request adds 'drop_while' as a doc-alias for 'skip_while'.

r? `@joshtriplett`

aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust