Update src/utils/utilities.jl

Co-authored-by: Gregory L. Wagner <gregory.leclaire.wagner@gmail.com>

Author: charleskawczynski

src/utils/utilities.jl

@@ -559,6 +559,6 @@ A helper function which returns `∑tendencies` when `tendency` is a
 `NullBroadcasted` and `lazy.(∑tendencies - tendency)` when `tendency` is not a
 `NullBroadcasted`.
 """
-function sub_tend end
+function subtract_tendency end
 sub_tend(∑tends, ::NullBroadcasted) = ∑tends
 sub_tend(∑tends, t) = lazy.(∑tends .- t)