Reduce title minimum length to two characters

[tmorrell]

Is your feature request related to a problem? Please describe.

We have an article that is titled R², but we can't use that as the title because of the current three character limit

Article: https://doi.org/10.1111/j.1540-6261.1988.tb04591.x
Record: https://authors.library.caltech.edu/records/d0wft-77023

Describe the solution you'd like

Changing the limit to two characters will allow us to accurately represent this article title.

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