Rollup merge of rust-lang#137322 - alexcrichton:update-wasm-docs, r=jieyouxu

Update docs for default features of wasm targets

LLVM 20 enabled the `nontrapping-fptoint` and `bulk-memory` features by default, so this updates the corresponding documentation for the `wasm32-*` targets (which all point to `wasm32-unknown-unknown`).

Closes rust-lang#137315 with a doc update for the doc part.

Author: workingjubilee

src/doc/rustc/src/platform-support/wasm32-unknown-unknown.md

@@ -129,6 +129,8 @@ As of the time of this writing the proposals that are enabled by default (the
 * `mutable-globals`
 * `reference-types`
 * `sign-ext`
+* `nontrapping-fptoint` (Rust 1.87.0+, LLVM 20+)
+* `bulk-memory` (Rust 1.87.0+, LLVM 20+)
 
 If you're compiling WebAssembly code for an engine that does not support a
 feature in LLVM's default feature set then the feature must be disabled at