Rollup merge of #151639 - zzaekkii:wasm32-wasip1, r=madsmtm

Fix broken WASIp1 reference link

### Location (URL)
https://doc.rust-lang.org/rustc/platform-support/wasm32-wasip1.html

<img width="800" alt="image" src="https://github.com/user-attachments/assets/b9402b3a-db7b-405f-b4ef-d849c03ad893" />

### Summary
The WASIp1 reference link in the `wasm32-wasip1` platform documentation currently points to a path that no longer exists in the WASI repository.

The WASI project recently migrated the WASI 0.1 (preview1) documentation from the `legacy/preview1` directory to the dedicated `wasi-0.1` branch (WebAssembly/WASI#855).

This updates the link to point to the intended historical WASIp1 reference, which matches the documented intent of the `wasm32-wasip1` target.

Author: Zalathar