update std::autodiff link to point to nighlty autodiff docs

diff --git a/src/autodiff/internals.md b/src/autodiff/internals.md
index e381b09..b50416b 100644
--- a/src/autodiff/internals.md
+++ b/src/autodiff/internals.md

@@ -15,7 +15,7 @@
 }
 ```
 
-The detailed documentation for the `std::autodiff` module is available at [std::autodiff](https://doc.rust-lang.org/std/autodiff/index.html).
+The detailed documentation for the `std::autodiff` module is available at [std::autodiff](https://doc.rust-lang.org/nightly/std/autodiff/index.html).
 
 Differentiable programming is used in various fields like numerical computing, [solid mechanics][ratel], [computational chemistry][molpipx], [fluid dynamics][waterlily] or for Neural Network training via Backpropagation, [ODE solver][diffsol], [differentiable rendering][libigl], [quantum computing][catalyst], and climate simulations.
 
@@ -25,3 +25,5 @@
 [diffsol]: https://github.com/martinjrobins/diffsol
 [libigl]: https://github.com/alecjacobson/libigl-enzyme-example?tab=readme-ov-file#run
 [catalyst]: https://github.com/PennyLaneAI/catalyst
+
+