docs(guide): The target `wasm32-unknown-emscripten` is now supported

The guide documents a reference on rust targets that's not been modified for approx 8 years. Perhaps this section at the end should be updated, I'm not familiar enough with the project to know if the 2nd half of the referenced paragraph remains relevant/useful, this is just an issue to raise awareness of the two outdated rust targets cited.

Contributed Sep 2018:

https://github.com/wasm-bindgen/wasm-bindgen/blob/1a2860ea1c2d730150bb71b37969165f8c68ed2f/guide/src/reference/rust-targets.md?plain=1#L67-L72

• The target asmjs-unknown-emscripten was removed in Rust 1.76 (Feb 2024)

• Support for the target wasm32-unknown-emscripten landed in this March 2026 PR (released in 0.2.115).

  https://github.com/wasm-bindgen/wasm-bindgen/blob/1a2860ea1c2d730150bb71b37969165f8c68ed2f/CHANGELOG.md?plain=1#L600-L604

  There has been various follow-ups since then to smooth out that support, and there are still issues like this one which may be necessary to document caveats if they're not easy to resolve.

At a glance there is also this .cargo/config.toml addition from the emscripten feature PR, which may have relevant context for users to adopt when building for the target? (I think the static relocation is to disable PIC?)

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While on the topic of documentation, separately there appears to be a typo (elimainte => eliminate):

https://github.com/wasm-bindgen/wasm-bindgen/blob/1a2860ea1c2d730150bb71b37969165f8c68ed2f/build.rs#L44-L48