doc formating issue in qiskit.pulse.library.Square_fun.rst (backport #13007)

[mergify[bot]]

Summary

There ar e some formatting issues in https://docs.quantum.ibm.com/api/qiskit/qiskit.pulse.library.Square_fun.rst

Details and comments

With this PR, the doc looks like this:

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This is an automatic backport of pull request #13007 done by Mergify.

[qiskit-bot]

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[coveralls]

Pull Request Test Coverage Report for Build 10493655537

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.04%) to 89.847%

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Files with Coverage Reduction	New Missed Lines	%
crates/qasm2/src/lex.rs	2	93.23%
<!--	Total:	2		-->

Totals
Change from base Build 10491461200:	0.04%
Covered Lines:	66833
Relevant Lines:	74385

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💛 - Coveralls