Rollup merge of #33779 - GuillaumeGomez:repr-simd, r=steveklabnik

Update repr_simd

r? @steveklabnik

src/librustc_typeck/diagnostics.rs

@@ -978,18 +978,18 @@ struct Foo { x: Option<Box<Foo>> }
 This will cause an error:
 
 ```compile_fail
-#![feature(simd)]
+#![feature(repr_simd)]
 
-#[simd]
+#[repr(simd)]
 struct Bad<T>(T, T, T);
 ```
 
 This will not:
 
 ```
-#![feature(simd)]
+#![feature(repr_simd)]
 
-#[simd]
+#[repr(simd)]
 struct Good(u32, u32, u32);
 ```
 "##,
@@ -1026,18 +1026,18 @@ struct Foo { x: Option<Box<Foo>> }
 This will cause an error:
 
 ```compile_fail
-#![feature(simd)]
+#![feature(repr_simd)]
 
-#[simd]
+#[repr(simd)]
 struct Bad(u16, u32, u32);
 ```
 
 This will not:
 
 ```
-#![feature(simd)]
+#![feature(repr_simd)]
 
-#[simd]
+#[repr(simd)]
 struct Good(u32, u32, u32);
 ```
 "##,
@@ -1049,18 +1049,18 @@ struct Foo { x: Option<Box<Foo>> }
 This will cause an error:
 
 ```compile_fail
-#![feature(simd)]
+#![feature(repr_simd)]
 
-#[simd]
+#[repr(simd)]
 struct Bad(String);
 ```
 
 This will not:
 
 ```
-#![feature(simd)]
+#![feature(repr_simd)]
 
-#[simd]
+#[repr(simd)]
 struct Good(u32, u32, u32);
 ```
 "##,