Adjust the wasm32-unknown-unknown atomic docs
#382
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Currently the documentation on how to target
wasm32-unknown-unknownwith-C target-feature=+atomicsis incorrect and will yield compile errors.This is because
wasm32-unknown-unknowndoesn't support unwinding, but-Zbuild-stddoesn't support automatic selection of the correct panic strategy, so this has to be set manually with-Zbuild-std=panic_abort,std.This PR corrects the documentation to reflect this.
See rust-lang/wg-cargo-std-aware#29.
Fixes #267.