Review comments

Author: alexcrichton

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

@@ -141,7 +141,7 @@ Rust standard library additionally must be recompiled.
 Compiling all code for the initial release of WebAssembly looks like:
 
 ```sh
-$ export RUSTFLAG=-Ctarget-cpu=mvp
+$ export RUSTFLAGS=-Ctarget-cpu=mvp
 $ cargo +nightly build -Zbuild-std=panic_abort,std --target wasm32-unknown-unknown
 ```
 
@@ -166,7 +166,7 @@ about the supported WebAssembly features the engine has.
 
 Note that it is still possible for Rust crates and libraries to enable
 WebAssembly features on a per-function level. This means that the build
-command above may not be sufficent to disable all WebAssembly features. If the
+command above may not be sufficient to disable all WebAssembly features. If the
 final binary still has SIMD instructions, for example, the function in question
 will need to be found and the crate in question will likely contain something
 like:

src/doc/rustc/src/platform-support/wasm32-wasip1-threads.md

@@ -162,3 +162,17 @@ It's recommended to conditionally compile code for this target with:
 Prior to Rust 1.80 the `target_env = "p1"` key was not set. Currently the
 `target_feature = "atomics"` is Nightly-only. Note that the precise `#[cfg]`
 necessary to detect this target may change as the target becomes more stable.
+
+## Enabled WebAssembly features
+
+The default set of WebAssembly features enabled for compilation is similar to
+[`wasm32-unknown-unknokwn`](./wasm32-unknown-unknown.md) but two more features
+are included:
+
+* `bulk-memory`
+* `atomics`
+
+For more information about features see the documentation for
+[`wasm32-unknown-unknokwn`](./wasm32-unknown-unknown.md), but note that the
+`mvp` CPU in LLVM does not support this target as it's required that
+`bulk-memory`, `atomics`, and `mutable-globals` are all enabled.

src/doc/rustc/src/platform-support/wasm32-wasip1.md

@@ -136,6 +136,5 @@ to Rust 1.80 the `target_env` condition was not set.
 ## Enabled WebAssembly features
 
 The default set of WebAssembly features enabled for compilation is currently the
-same across all WebAssembly targets. For more information on WebAssembly
-features see the documentation for
-[`wasm32-unknown-unknokwn`](./wasm32-unknown-unknown.md)
+same as [`wasm32-unknown-unknokwn`](./wasm32-unknown-unknown.md). See the
+documentation there for more information.

src/doc/rustc/src/platform-support/wasm32-wasip2.md

@@ -65,6 +65,5 @@ It's recommended to conditionally compile code for this target with:
 ## Enabled WebAssembly features
 
 The default set of WebAssembly features enabled for compilation is currently the
-same across all WebAssembly targets. For more information on WebAssembly
-features see the documentation for
-[`wasm32-unknown-unknokwn`](./wasm32-unknown-unknown.md)
+same as [`wasm32-unknown-unknokwn`](./wasm32-unknown-unknown.md). See the
+documentation there for more information.