Tiny follow up to #12983 (backport #12999)

[mergify[bot]]

Summary

Tiny follow up on #12983 fixing a typos & updating releasenotes.

Details and comments

Since MUMBAI_CMAP is only internally available, I suggested a change to a full example in the reno 🙂

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This is an automatic backport of pull request #12999 done by Mergify.

[mergify[bot]]

Cherry-pick of b90c7a706f3848310fa1c0ddaaea5994b78ecfa4 has failed:

On branch mergify/bp/stable/1.2/pr-12999
Your branch is up to date with 'origin/stable/1.2'.

You are currently cherry-picking commit b90c7a706.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
    both modified:   qiskit/transpiler/passes/routing/stochastic_swap.py
    deleted by us:   releasenotes/notes/deprecate-StochasticSwap-451f46b273602b7b.yaml

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[qiskit-bot]

Thank you for opening a new pull request.

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While you're waiting, please feel free to review other open PRs. While only a subset of people are authorized to approve pull requests for merging, everyone is encouraged to review open pull requests. Doing reviews helps reduce the burden on the core team and helps make the project's code better for everyone.

One or more of the following people are relevant to this code:

• @Qiskit/terra-core

[ElePT]

Accidentally triggered the backport for this PR that didn't need it.