Syntax error when formatting luau return type and trailing comment

[filiptibell]

Formatting a function with a comment after a single return type enclosed in parentheses formats the code from something like this:

function foo(): (
	nil -- Some comment
)
	return nil
end

To this:

function foo(): (nil -- Some comment)
	return nil
end

The closing parentheses is now part of the comment and produces a syntax error.
StyLua could either enforce no parentheses on single return types or format it as the original code block when parentheses are found, either solution works IMO.

[JohnnyMorganz]

Going to separate out the parentheses removal as a separate feature request: #611