Formatter removes //! comments at the top of the file

[sdankel]

Related #5052

[sdankel]

@eureka-cpu You said you fixed this before, do you want to take a look at why this regressed?

[eureka-cpu]

If @cr-fuel or @andrewvious are keen to take it on that's fine w me

To give some context, I implemented the module level doc comments in the compiler to be able to get documentation working for forc-doc and somewhere along the way before then they were just treated as regular comments.

[eureka-cpu]

Here are the relevant PRs that added in module level doc comments: #4081 #4113
Here is the file where I was testing the inner doc comment formatting: https://github.com/FuelLabs/sway/pull/4081/files#diff-1f22ed7929aa55dd3839a9661721934181afa002d417d5c834314413cf620952
Here is where you will likely need to begin tracking the bug down: https://github.com/FuelLabs/sway/blob/master/swayfmt/src/utils/language/attribute.rs#L82

Hope that helps, let me know if you have any questions

[andrewvious]

I've got it fixed, opening a PR now.