doc: remove #![feature(asm)]

The `asm` feature has been stabilized by <rust-lang/rust#91728>.
r3-os · Feb 23, 2022 · 4ffba16 · 4ffba16
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diff --git a/README.md b/README.md
@@ -46,7 +46,6 @@ The R3 original kernel is provided as a separate package [`r3_kernel`][].
 ## Example
 
 ```rust
-#![feature(asm)]
 #![feature(asm_sym)]
 #![feature(const_fn_trait_bound)]
 #![feature(const_refs_to_cell)]