rustdoc has incorrect spacing for `repr` attributes

[varkor]

See https://github.com/rust-lang/rust/pull/69686/files#diff-21534ccecd1da87ab2d0cbabae0ca694R19 for an example.

#[repr(C, align (8))]

There should not be a space between align and the opening parenthesis.