Merge pull request #1211 from Rosto75/master

A couple of fixes for the `HashMap` chapter.

Author: marioidival

src/std/hash/alt_key_types.md

@@ -50,8 +50,8 @@ fn try_logon<'a>(accounts: &Accounts<'a>,
     println!("Attempting logon...");
 
     let logon = Account {
-        username: username,
-        password: password,
+        username,
+        password,
     };
 
     match accounts.get(&logon) {

src/std/hash/hashset.md

@@ -36,8 +36,8 @@ Try all of these in the following example:
 use std::collections::HashSet;
 
 fn main() {
-    let mut a: HashSet<i32> = vec!(1i32, 2, 3).into_iter().collect();
-    let mut b: HashSet<i32> = vec!(2i32, 3, 4).into_iter().collect();
+    let mut a: HashSet<i32> = vec![1i32, 2, 3].into_iter().collect();
+    let mut b: HashSet<i32> = vec![2i32, 3, 4].into_iter().collect();
 
     assert!(a.insert(4));
     assert!(a.contains(&4));