Update posts/2025-03-04-Rustup-1.28.1.md

Co-authored-by: Chris Denton <christophersdenton@gmail.com>

Author: Mark-Simulacrum

posts/2025-03-04-Rustup-1.28.1.md

@@ -26,14 +26,17 @@ the change with regard to implicit toolchain installation is being discussed in
 This release contains the following fixes:
 
 - Automatic install is enabled by default but can be opted out by setting `RUSTUP_AUTO_INSTALL`
-  environment variable to `0`. [pr#4214]
+  environment variable to `0`. [pr#4214] [pr#4227]
 - `rustup show active-toolchain` will only print a single line, as it did in 1.27. [pr#4221]
 - Fixed a bug in the reqwest backend that would erroneously timeout downloads after 30s. [pr#4218]
+- Use relative symlinks for proxies. [pr#4226]
 
 [1.28.1]: https://github.com/rust-lang/rustup/releases/tag/1.28.1
 [pr#4214]: https://github.com/rust-lang/rustup/pull/4214
 [pr#4221]: https://github.com/rust-lang/rustup/pull/4221
 [pr#4218]: https://github.com/rust-lang/rustup/pull/4218
+[pr#4226]: https://github.com/rust-lang/rustup/pull/4226
+[pr#4227]: https://github.com/rust-lang/rustup/pull/4227
 
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