Fix bad header in 0.46 release note

[Eric-Arellano]

Closes #11836. As explained there, the problem is from Sphinx rather than our API generation script. It's using a <dl> in HTML where it should not be.

After, the list works properly:

[coveralls]

Pull Request Test Coverage Report for Build 7908177852

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 6 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.03%) to 89.232%

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Files with Coverage Reduction	New Missed Lines	%
crates/qasm2/src/lex.rs	6	91.44%

Totals
Change from base Build 7907826474:	0.03%
Covered Lines:	58847
Relevant Lines:	65948

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💛 - Coveralls

[qiskit-bot]

One or more of the the following people are requested to review this:

• @Qiskit/terra-core

[Eric-Arellano]

This is ready for review and would be good to include in the 1.0 release. I'm not sure if it should be included directly in #11760?

[jakelishman]

At this point, it's probably best just to do it with the rest of the release notes. I've applied this patch to #11760 in 476c945, so I'll close this PR - thanks for pointing it out.