edit comment on CanonAbi::try_from_extern_abi

Author: workingjubilee

compiler/rustc_abi/src/canon_abi.rs

@@ -136,7 +136,8 @@ impl CanonAbi {
 
     /// convert an ExternAbi to a CanonAbi if it maps directly
     ///
-    /// Pretty incorrect to publicly expose!
+    /// Like `to_erased_extern_abi`, this is only intended for internal usage by
+    /// CanonAbi's implementation, as it is not "target-aware".
     const fn try_from_extern_abi(extern_abi: ExternAbi) -> Result<Self, AbiConvErr> {
         match extern_abi {
             ExternAbi::C { unwind: false } => Ok(Self::C),