Review annotations to terms using leucine

[pgaudet]

This is to check annotations to confirm that we can rename terms to L-leucine xx.

GO:0071233 | cellular response to leucine GO:0070728 | leucine binding GO:0009098 | leucine biosynthetic process GO:0006552 | leucine catabolic process GO:0098713 | leucine import across plasma membrane GO:0006551 | leucine metabolic process GO:0015820 | leucine transport GO:0043201 | response to leucine