A couple of bugs in forc fmt.

[otrho]

I noticed the following when running forc fmt over the test suite:

struct A {
a: u64,
b: u64,
}
fn get_gas() -> A {
A {
a: asm() {
ggas
},
b: asm() {
cgas
}
}
}

is formatted to:

struct A {
    a: u64,
    b: u64,
}
fn get_gas() -> A {
    A {
        a: asm() {
            ,
            ggas
        }
        b: asm() {
            ,
            cgas
        }
    }
}

and the following:

enum B {
/// A docstring
A: u64,
/// B docstring
B: u64,
}

struct C {
/// a docstring
a: A,
/// b docstring
b: byte,
}

is formatted to:

enum B { /// A docstring
    A: u64, /// B docstring
    B: u64,
}

struct C { /// a docstring
    a: A, /// b docstring
    b: byte,
}

[sezna]

cc @leviathanbeak

[leviathanbeak]

thanks @otrho for reporting