Update src/doc/rustc/src/platform-support.md

Co-authored-by: Josh Triplett <[email protected]>

Author: alexcrichton

src/doc/rustc/src/platform-support.md

@@ -276,7 +276,7 @@ target | std | host | notes
 `thumbv7a-pc-windows-msvc` | ? |  |
 `thumbv7a-uwp-windows-msvc` | ✓ |  |
 `thumbv7neon-unknown-linux-musleabihf` | ? |  | Thumb2-mode ARMv7a Linux with NEON, MUSL
-`wasm64-unknown-unknown` | ? |  | WebAssembly
+[`wasm64-unknown-unknown`](platform-support/wasm64-unknown-unknown.md) | ? |  | WebAssembly
 `x86_64-apple-ios-macabi` | ✓ |  | Apple Catalyst on x86_64
 `x86_64-apple-tvos` | * | | x86 64-bit tvOS
 `x86_64-pc-windows-msvc` | ✓ |  | 64-bit Windows XP support