made print message similar across two loops

diff --git a/src/doc/book/vectors.md b/src/doc/book/vectors.md
index d9379117c86b8d451d6d75b238feac0a5158af2b..1c120186aabbdd63ec26e984feaee3694e59deec 100644 (file)
--- a/src/doc/book/vectors.md
+++ b/src/doc/book/vectors.md
@@ -141,7 +141,7 @@ for i in &v {
 }
 
 for i in &v {
-    println!("This is a reference {}", i);
+    println!("This is a reference to {}", i);
 }
 ```