Update HashMap documentation hint of the used 'quadratic probing' and 'SIMD lookup' algorithms

Author: TheSamsa

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::*;
 }