Fix missing platform support doc link

jieyouxu · Mark-Simulacrum · commit 16329e655e6e · 2025-03-22T10:47:51.000-07:00
diff --git a/templates/relnotes.md b/templates/relnotes.md
@@ -22,6 +22,8 @@ Platform Support
 Refer to Rust's [platform support page][platform-support-doc]
 for more information on Rust's tiered platform support.
 
+[platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html
+
 <a id="{{version}}-Libraries"></a>
 
 Libraries
