Replace cfg(rustdoc) with cfg(doc)

`cfg(doc)` has been stabilized in rust-lang/rust#61351.

Author: yvt

tcw3/pal/src/iface.rs

@@ -235,7 +235,7 @@ impl<T: Wm, TLayer: Debug> Debug for WndAttrs<'_, T, TLayer> {
     }
 }
 
-#[cfg_attr(rustdoc, svgbobdoc::transform)]
+#[cfg_attr(doc, svgbobdoc::transform)]
 /// Specifies layer attributes.
 #[allow(clippy::option_option)] // for consistency between fields
 #[derive(Debug, Clone)]

tcw3/pal/src/lib.rs

@@ -2,7 +2,6 @@
 //!
 //! This crate is reexported by TCW3 as `tcw3::pal`.
 #![feature(const_fn)] // `'static` bounds on `const fn` parameters
-#![feature(doc_cfg)] // `cfg(rustdoc)`
 #![feature(is_sorted)] // `<[_]>::is_sorted`
 #![feature(unsized_locals)] // Call `dyn FnOnce`
 #![allow(clippy::float_cmp)]

tcw3/src/lib.rs

@@ -5,7 +5,6 @@
 //!  - **Color management**: Color values are specified in the sRGB color space,
 //!    unless otherwise specified.
 //!
-#![feature(doc_cfg)] // `cfg(rustdoc)`
 #![feature(unsized_locals)] // Call `dyn FnOnce`
 #![feature(const_if_match)] // `if` and `match` in `const fn`
 #![feature(const_fn)] // conditional expressions in `const fn`

tcw3/src/ui/types.rs

@@ -5,7 +5,7 @@ use cggeom::{prelude::*, Box2};
 use crate::uicore::SizeTraits;
 
 bitflags! {
-    #[cfg_attr(rustdoc, svgbobdoc::transform)]
+    #[cfg_attr(doc, svgbobdoc::transform)]
     /// Describes how to align a layout element within the containing box.
     ///
     /// ```svgbob