Fix rustdoc lints

Author: Mark-Simulacrum

library/portable-simd/crates/core_simd/src/intrinsics.rs

@@ -103,7 +103,7 @@ extern "platform-intrinsic" {
     /// val: vector of values to select if a lane is masked
     /// ptr: vector of pointers to read from
     /// mask: a "wide" mask of integers, selects as if simd_select(mask, read(ptr), val)
-    /// note, the LLVM intrinsic accepts a mask vector of <N x i1>
+    /// note, the LLVM intrinsic accepts a mask vector of `<N x i1>`
     /// FIXME: review this if/when we fix up our mask story in general?
     pub(crate) fn simd_gather<T, U, V>(val: T, ptr: U, mask: V) -> T;
     /// llvm.masked.scatter

library/portable-simd/crates/core_simd/src/ops.rs

@@ -40,7 +40,7 @@ macro_rules! unsafe_base {
 
 /// SAFETY: This macro should not be used for anything except Shl or Shr, and passed the appropriate shift intrinsic.
 /// It handles performing a bitand in addition to calling the shift operator, so that the result
-/// is well-defined: LLVM can return a poison value if you shl, lshr, or ashr if rhs >= <Int>::BITS
+/// is well-defined: LLVM can return a poison value if you shl, lshr, or ashr if `rhs >= <Int>::BITS`
 /// At worst, this will maybe add another instruction and cycle,
 /// at best, it may open up more optimization opportunities,
 /// or simply be elided entirely, especially for SIMD ISAs which default to this.