Fix syntax error on code snippet (#246)

* Fix syntax error on code snippet

* Added comma to struct definition on code snippet

* cargo fmt, remove ignore flag

Co-authored-by: Marco Ieni <11428655+MarcoIeni@users.noreply.github.com>

Author: Jaxelr

anti_patterns/deref.md

@@ -25,7 +25,7 @@ public static void main(String[] args) {
 
 We can use the deref polymorphism anti-pattern to do so:
 
-```rust,ignore
+```rust
 use std::ops::Deref;
 
 struct Foo {}
@@ -34,11 +34,10 @@ impl Foo {
     fn m(&self) {
         //..
     }
-
 }
 
 struct Bar {
-    f: Foo
+    f: Foo,
 }
 
 impl Deref for Bar {
@@ -49,7 +48,7 @@ impl Deref for Bar {
 }
 
 fn main() {
-    let b = Bar { Foo {} };
+    let b = Bar { f: Foo {} };
     b.m();
 }
 ```