remove //

Author: SbstnErhrdt

src/scope/lifetime/explicit.md

@@ -40,7 +40,7 @@ fn failed_borrow<'a>() {
     let _x = 12;
 
     // ERROR: `_x` does not live long enough
-    //let y: &'a i32 = &_x;
+    let y: &'a i32 = &_x;
     // Attempting to use the lifetime `'a` as an explicit type annotation 
     // inside the function will fail because the lifetime of `&_x` is shorter
     // than that of `y`. A short lifetime cannot be coerced into a longer one.