Fix documentation for utils.optionals data values (backport #13098)

[mergify[bot]]

We're adding proper support to .. py:data:: to docs.quantum.ibm.com. However, we cannot easily handle .. py:data:: being inside a table - it would complicate both the code and visual design.

So, this PR removes the table and uses .. py:data:: like we use it everywhere else in Qiskit.

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This is an automatic backport of pull request #13098 done by Mergify.

[mergify[bot]]

Cherry-pick of 254ba83dc637a22a91cee0a0cd1c453f89ca55da has failed:

On branch mergify/bp/stable/0.46/pr-13098
Your branch is up to date with 'origin/stable/0.46'.

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    both modified:   qiskit/utils/optionals.py

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[coveralls]

Pull Request Test Coverage Report for Build 10778463974

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 5 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.02%) to 87.217%

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Files with Coverage Reduction	New Missed Lines	%
qiskit/synthesis/two_qubit/two_qubit_decompose.py	2	96.72%
crates/qasm2/src/lex.rs	3	92.88%
<!--	Total:	5		-->

Totals
Change from base Build 10454948743:	0.02%
Covered Lines:	74535
Relevant Lines:	85459

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💛 - Coveralls

[Eric-Arellano]

@jakelishman it's not very important to land this in Qiskit 0.46. For example, we're not adding it to 1.0 and 1.1. The docs still render fine, only they don't have the little anchor icon & objects.inv's links don't take you to the right part of the page.

Shall we close this given the non-trivial merge conflict?

[eliarbel]

@Eric-Arellano FWIW, please check out #13111. I've opened it against #13101. If it's ok let's apply the changes there and have it included in 0.46.3. Note that #13111 also includes a few minor fixes relevant for 1.3.