Dedent docstrings in JumpProblemLibrary

[abhro]

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• All documentation related to code changes were updated
• The new code follows the contributor guidelines, in particular the SciML Style Guide and COLPRAC.
• Any new documentation only uses public API

Additional context

Make sure that sentence text is not picked up as code examples by doc formatters and viewers.