doc fix (backport #13914)

[mergify]

Summary

Details and comments

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This is an automatic backport of pull request #13914 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 67c7406 has failed:

On branch mergify/bp/stable/1.4/pr-13914
Your branch is up to date with 'origin/stable/1.4'.

You are currently cherry-picking commit 67c740601.
  (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 <file>..." to mark resolution)
	both modified:   crates/accelerate/src/sparse_observable.rs

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.

Before your PR can be merged it will first need to pass continuous integration tests and be reviewed. Sometimes the review process can be slow, so please be patient.

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

[coveralls]

Pull Request Test Coverage Report for Build 13504890366

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.01%) to 88.863%

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Files with Coverage Reduction	New Missed Lines	%
crates/qasm2/src/lex.rs	3	92.23%

Totals
Change from base Build 13498429288:	0.01%
Covered Lines:	79396
Relevant Lines:	89347

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💛 - Coveralls