Broken/unexpected formatting of comments after members

[milesziemer]

1. Trailing comments get moved to a weird spot:

structure A {
    a: String // a
}

becomes

structure A {
    a: String

    // a
}

2. With default value assignments, you get an extra newline if you had a trailing comment in the shape body:

structure A {
    a: String = ""
    // a
}

becomes:

structure A {
    a: String = ""

    // a

}

3. Invalid doc comments also aren't fixed if they come after a default value assignment:

structure A {
    a: String = "" /// a
}

structure B {
    b: String = ""
    /// a
}

don't change.

Not sure about 1, but for 2 and 3, it has something to do with the fact that ValueAssignment contains all whitespace following it (through BR)