Merge pull request #209 from tatsuya6502/fix-code-block-in-ch03-05

ch03-05：リスティング03-05のタイポ修正

Author: tatsuya6502

listings/ch03-common-programming-concepts/listing-03-05/src/main.rs

@@ -2,7 +2,6 @@ fn main() {
     let a = [10, 20, 30, 40, 50];
 
     for element in a {
-        for element in a {
         println!("the value is: {}", element);
     }
 }

rust-toolchain

@@ -1 +1 @@
-1.41.0
+1.59