Fix indentation preventing \end{equation} from rendering

[dlebauer]

Summary

• What: Just docs
• Motivation: Currently one equation is not rendering b/c extra spaces, so renders as:

How was this change tested?

🤞🏻 will check built site preview

Checklist

• Related issues are listed above. PRs without an approved, related issue may not get reviewed.
• PR title has the issue number in it ("[#] <concise description of proposed change>")
• Tests added/updated for new features (if applicable)
• Documentation updated (if applicable)
• docs/CHANGELOG.md updated with noteworthy changes
• Code formatted with clang-format (run git clang-format if needed)

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Note: See CONTRIBUTING.md for additional guidance. This repository uses automated formatting checks; if the pre-commit hook blocks your commit, run git clang-format to format staged changes.

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