book: Add a link to rust's UEFI target docs

nicholasbishop · nicholasbishop · commit 574e37e3c5ea · 2024-01-13T13:30:51.000-05:00
diff --git a/book/src/reference.md b/book/src/reference.md
@@ -1,5 +1,6 @@
 # Reference
 
+* [Rust `*-unknown-uefi` targets](https://doc.rust-lang.org/rustc/platform-support/unknown-uefi.html)
 * [`uefi` crate reference](https://docs.rs/uefi)
 * [`uefi-macros` crate reference](https://docs.rs/uefi-macros)
 * [`uefi-raw` crate reference](https://docs.rs/uefi-raw)
