Change 3_prime_UTR_variant to three_prime_UTR_variant

[CristianRiccio]

What is the SO term name and accession?
3_prime_UTR_variant (SO:0001624)

Describe what you would like to change.
I would like to change the term to three_prime_UTR_variant to make it consistent with the term three_prime_UTR (SO:0000205). Using letters instead of a number also has the advantage of being more tolerated/consistent with computer programs and more intuitively sortable alphabetically.

Relevant Publications
https://www.nature.com/articles/s41467-019-10717-9
PMID: 32461616
Whiffin, N., Karczewski, K. J., Zhang, X., Chothani, S., Smith, M. J., Evans, D. G., Roberts, A. M., Quaife, N. M., Schafer, S., Rackham, O., Alföldi, J., O'Donnell-Luria, A. H., Francioli, L. C., Genome Aggregation Database Production Team, Genome Aggregation Database Consortium, Cook, S. A., Barton, P. J. R., MacArthur, D. G., & Ware, J. S. (2020). Characterising the loss-of-function impact of 5' untranslated region variants in 15,708 individuals. Nature communications, 11(1), 2523. https://doi.org/10.1038/s41467-019-10717-9