[docs] [issue23677] Mention dict and set comps in library reference

Change by Furkan Onder <furkanonder@protonmail.com>: ---------- nosy: +furkanonder nosy_count: 8.0 -> 9.0 pull_requests: +19337 stage: needs patch -> patch review pull_request: https://github.com/python/cpython/pull/20027 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue23677> _______________________________________