TYPO: typo fix in triangular prior

I got an error in tests when running this locally. It looks like a fairly obvious typo.

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changed milestone to %2.2.1

mentioned in merge request !1303 (merged)

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• 9d57f395...14b069ec - 4 commits from branch master
• 317c382c - TYPO: typo fix in triangular prior

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merged

mentioned in merge request !1305 (merged)