Rollup merge of rust-lang#96988 - ehuss:fix-platform-links, r=JohnTitor

Fix platform support links.

Hermitkernel was removed in rust-lang#95299.  nvptx was added in rust-lang#95896 without being added to the SUMMARY.

Author: matthiaskrgr

src/doc/rustc/src/SUMMARY.md

@@ -15,12 +15,12 @@
 - [Platform Support](platform-support.md)
     - [Template for target-specific documentation](platform-support/TEMPLATE.md)
     - [aarch64-apple-ios-sim](platform-support/aarch64-apple-ios-sim.md)
-    - [aarch64-unknown-none-hermitkernel](platform-support/aarch64-unknown-none-hermitkernel.md)
     - [armv7-unknown-linux-uclibceabi](platform-support/armv7-unknown-linux-uclibceabi.md)
     - [armv7-unknown-linux-uclibceabihf](platform-support/armv7-unknown-linux-uclibceabihf.md)
     - [\*-kmc-solid_\*](platform-support/kmc-solid.md)
     - [m68k-unknown-linux-gnu](platform-support/m68k-unknown-linux-gnu.md)
     - [mips64-openwrt-linux-musl](platform-support/mips64-openwrt-linux-musl.md)
+    - [nvptx64-nvidia-cuda](platform-support/nvptx64-nvidia-cuda.md)
     - [*-unknown-openbsd](platform-support/openbsd.md)
     - [wasm64-unknown-unknown](platform-support/wasm64-unknown-unknown.md)
     - [x86_64-unknown-none](platform-support/x86_64-unknown-none.md)