Rollup merge of rust-lang#80068 - jyn514:mut-reference, r=m-ou-se

JohnTitor · web-flow · commit dbcf659dce56 · 2020-12-19T15:16:05.000+09:00
Add `&mut` as an alias for 'reference' primitive Closes rust-lang#46075.
diff --git a/library/std/src/primitive_docs.rs b/library/std/src/primitive_docs.rs
@@ -924,6 +924,7 @@ mod prim_usize {}
 
 #[doc(primitive = "reference")]
 #[doc(alias = "&")]
+#[doc(alias = "&mut")]
 //
 /// References, both shared and mutable.
 ///
