Issue 42167: Documentation for SETUP_WITH opcode is wrong

bpo-33387 introduced two new opcodes, `RERAISE` and `WITH_EXCEPT_START` (previously called `WITH_EXCEPT_FINISH`), replacing the previous `WITH_CLEANUP_START`, `WITH_CLEANUP_FINISH`,
`BEGIN_FINALLY`, `END_FINALLY`, `CALL_FINALLY` and `POP_FINALLY`.

The [documentation](https://docs.python.org/3.9/library/dis.html#opcode-SETUP_WITH) for it references the since removed `WITH_CLEANUP_START`, which is definitely wrong. I don't know enough to be able to fix it though, sorry, so I've added the core team.

Note that SETUP_WITH doc was completely removed. Not sure if that was intentional (since the opcode itself still exists).

It was, at least partially, replaced by BEGIN_WITH for bpo-40222: https://github.com/python/cpython/commit/adcd2205565f91c6719f4141ab4e1da6d7086126#diff-eaa488fc50d23b30ca8b24ab19e9c91c1c941339847af993e908f006eec0653bL741

Opcodes change from one version to another. You linked the Python 3.9 documentation. Python 3.9 opcodes are listed here: https://github.com/python/cpython/blob/3.9/Lib/opcode.py (and you can browse the branches and commit history for that file).

3.9 has SETUP_WITH, but not WITH_CLEANUP_START, so that particular doc entry is all that needs to change (assuming I'm not missing anything), since it wasn't updated during GH-6641.

I'll open a PR against the 3.9 docs.

GH-24334 already applied the necessary change for 3.10.