Update src/items/functions.md

Co-Authored-By: Mazdak Farrokhzad <[email protected]>

Author: nikomatsakis

src/items/functions.md

@@ -269,7 +269,7 @@ async fn safe_example() {
     let p = 22;
     let future = unsafe { unsafe_example(&p) };
     
-    // But no unsafe keyword required here. This will
+    // But no `unsafe` block required here. This will
     // read the value of `p`:
     let q = future.await;
 }