Add link to implementation description

Author: ehuss

src/rust-2024/rustdoc-doctests.md

@@ -31,13 +31,15 @@ pub fn subtract(left: u64, right: u64) -> u64 {
 }
 ```
 
-In this example, the two doctests will now be compiled in a single executable. Rustdoc will essentially place each example in a separate function within a single binary. The tests still run in independent processes as they did before, so any global state (like global statics) should still continue to work correctly.
+In this example, the two doctests will now be compiled in a single executable. Rustdoc will essentially place each example in a separate function within a single binary. The tests still run in independent processes as they did before, so any global state (like global statics) should still continue to work correctly.[^implementation]
 
 This change is only available in the 2024 Edition to avoid potential incompatibilities with existing doctests which may not work in a combined executable. However, these incompatibilities are expected to be extremely rare.
 
 [doctests]: ../../rustdoc/write-documentation/documentation-tests.html
 [libtest harness]: ../../rustc/tests/index.html
 
+[^implementation]: For more information on the details of how this work, see [Doctests - How were they improved?](https://blog.guillaume-gomez.fr/articles/2024-08-17+Doctests+-+How+were+they+improved%3F).
+
 ### Standalone tag
 
 In some situations it is not possible for rustdoc to combine examples in a single executable. Rustdoc will attempt to automatically detect if this is not possible, for example: