rustc book: fix *-pc-windows-msvc link label in sidebar

As far as I know, `*-unknown-windows-msvc` is not a thing. At least if I search for "unknown-windows-msvc" in the entire [rust-lang](https://github.com/rust-lang) organization (https://github.com/search?q=org%3Arust-lang+%22unknown-windows-msvc%22++&type=code&state=open), it gives only this occurrence and 3 other occurrences in https://github.com/rust-lang/lld, which was archived in 2019.

I believe `*-pc-windows-msvc` is the correct replacement because that is the name of the page the link points to:

ba86c0460b/src/doc/rustc/src/platform-support/windows-msvc.md (L1)
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Petr Pučil 2025-12-06 18:09:29 +01:00 committed by GitHub
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@ -130,7 +130,7 @@
- [\*-unknown-openbsd](platform-support/openbsd.md)
- [\*-unknown-redox](platform-support/redox.md)
- [\*-unknown-uefi](platform-support/unknown-uefi.md)
- [\*-unknown-windows-msvc](platform-support/windows-msvc.md)
- [\*-pc-windows-msvc](platform-support/windows-msvc.md)
- [\*-uwp-windows-msvc](platform-support/uwp-windows-msvc.md)
- [\*-wrs-vxworks](platform-support/vxworks.md)
- [wasm32-wasip1](platform-support/wasm32-wasip1.md)