Fix a docstring rst link rendering within an inline literal (backport #13567)

[mergify]

Changing from this:

to this:

If someone knows if there is a way to properly render an rst link within an inline literal text, I'd love to know.

---

This is an automatic backport of pull request #13567 done by [Mergify](https://mergify.com).

[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 12356154577

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.007%) to 88.95%

---

Files with Coverage Reduction	New Missed Lines	%
crates/qasm2/src/lex.rs	4	92.23%

Totals
Change from base Build 12354542060:	0.007%
Covered Lines:	79143
Relevant Lines:	88975

---

💛 - Coveralls