Rollup merge of rust-lang#67181 - TheSamsa:update-hashmap-doc, r=Dylan-DPC

Update hashmap doc

Update hint to the used algorithms. Skimmed over the longer description but could not find another mentioning of the old algorithms.

Closes rust-lang#67093

Author: JohnTitor

src/libstd/collections/mod.rs

@@ -433,7 +433,7 @@ mod hash;
 
 #[stable(feature = "rust1", since = "1.0.0")]
 pub mod hash_map {
-    //! A hash map implemented with linear probing and Robin Hood bucket stealing.
+    //! A hash map implemented with quadratic probing and SIMD lookup.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub use super::hash::map::*;
 }