Auto merge of #82641 - camelid:lang-item-docs, r=jyn514

Improve lang item generated docs

cc https://rust-lang.zulipchat.com/#narrow/stream/146229-wg-secure-code/topic/Is.20.60core.60.20part.20of.20the.20compiler.3F/near/226738260

r? `@jyn514`

compiler/rustc_data_structures/src/macros.rs

@@ -9,11 +9,11 @@ macro_rules! static_assert_size {
 #[macro_export]
 macro_rules! enum_from_u32 {
     ($(#[$attr:meta])* pub enum $name:ident {
-        $($variant:ident = $e:expr,)*
+        $($(#[$var_attr:meta])* $variant:ident = $e:expr,)*
     }) => {
         $(#[$attr])*
         pub enum $name {
-            $($variant = $e),*
+            $($(#[$var_attr])* $variant = $e),*
         }
 
         impl $name {
@@ -26,11 +26,11 @@ macro_rules! enum_from_u32 {
         }
     };
     ($(#[$attr:meta])* pub enum $name:ident {
-        $($variant:ident,)*
+        $($(#[$var_attr:meta])* $variant:ident,)*
     }) => {
         $(#[$attr])*
         pub enum $name {
-            $($variant,)*
+            $($(#[$var_attr])* $variant,)*
         }
 
         impl $name {