upgrade docify to 0.2.5 (#2052)
Updates `docify` to 0.2.5, which fixes some indentation bugs and adds the new `#[docify::export_content]` attribute which can be used like regular `#[docify::export]` but will only export the _underlying contents_ of the item it is attached to, if applicable (otherwise it just behaves exactly like `#[docify::export]`). Release notes here: https://github.com/sam0x17/docify/releases/tag/v0.2.5 cc @Kianenigma