Update the structural pinning link in readme.

The previous link anchor was broken in rust 1.77, because the
documentation was refactored in upstream rust.
Change the link to refer to the new section in the rust documentation.

Signed-off-by: Christian Schrefl <chrisi.schrefl@gmail.com>

Author: onestacked

README.md

@@ -222,7 +222,7 @@ the `kernel` crate. The [`sync`] module is a good starting point.
 
 [`sync`]: https://rust.docs.kernel.org/kernel/sync/index.html
 [pinning]: https://doc.rust-lang.org/std/pin/index.html
-[structurally pinned fields]: https://doc.rust-lang.org/std/pin/index.html#pinning-is-structural-for-field
+[structurally pinned fields]: https://doc.rust-lang.org/std/pin/index.html#projections-and-structural-pinning
 [stack]: https://docs.rs/pin-init/latest/pin_init/macro.stack_pin_init.html
 [`impl PinInit<Foo>`]: https://docs.rs/pin-init/latest/pin_init/trait.PinInit.html
 [`impl PinInit<T, E>`]: https://docs.rs/pin-init/latest/pin_init/trait.PinInit.html

src/lib.rs

@@ -247,7 +247,7 @@
 //! [`sync`]: https://rust.docs.kernel.org/kernel/sync/index.html
 //! [pinning]: https://doc.rust-lang.org/std/pin/index.html
 //! [structurally pinned fields]:
-//!     https://doc.rust-lang.org/std/pin/index.html#pinning-is-structural-for-field
+//!     https://doc.rust-lang.org/std/pin/index.html#projections-and-structural-pinning
 //! [stack]: crate::stack_pin_init
 #![cfg_attr(
     kernel,