fixup! rustc_target: introduce Vendor

Author: tamird

compiler/rustc_target/src/spec/mod.rs

@@ -2217,7 +2217,8 @@ pub struct TargetOptions {
     /// This field is *not* forwarded directly to LLVM; its primary purpose is `cfg(target_abi)`.
     /// However, parts of the backend do check this field for specific values to enable special behavior.
     pub abi: Abi,
-    /// Vendor name to use for conditional compilation (`target_vendor`). Defaults to "unknown".
+    /// Vendor name to use for conditional compilation (`target_vendor`).
+    /// Defaults to [`Vendor::Unknown("unknown")`](Vendor::Unknown).
     pub vendor: Vendor,
 
     /// Linker to invoke