-ized/-ised spelling inconsistency in AST

[zackmdavis]

(A tiny spelling nit I noticed while reviewing #57768; may be suitable for a new contributor to practice getting started with building rustc. I think we prefer the American spelling -ized, but maybe someone could confirm this?)

rust/src/libsyntax/ast.rs

Line 139 in 0c0c585

Parenthesized(ParenthesisedArgs),

[jonas-schievink]

Yes, AFAIK we use American spelling everywhere (as do most projects).