Update library/core/src/primitive_docs.rs

Co-authored-by: Jubilee <46493976+workingjubilee@users.noreply.github.com>

Author: ultrabear

library/core/src/primitive_docs.rs

@@ -1084,7 +1084,7 @@ impl<T> (T,) {}
 ///
 /// Note that most common platforms will not support `f16` in hardware without enabling extra target
 /// features, with the notable exception of Apple Silicon (also known as M1/2/etc) processors. For
-/// amd64 this requires the avx512fp16 feature, while RISC-V requires Zhf or Zhfmin, to have hardware support.
+/// Hardware support on x86-64 requires the avx512fp16 feature, while RISC-V requires Zhf.
 /// Usually the fallback implementation will be to use `f32` hardware if it exists, and convert
 /// between `f16` and `f32` when performing math.
 ///