Update .grit/patterns/js/no_implicit_coercion.md

Co-authored-by: Morgante Pell <[email protected]>

Author: scr2em

.grit/patterns/js/no_implicit_coercion.md

@@ -51,7 +51,7 @@ function parenthesized_or_not($exp){
 
 ```
 
-Code examples:
+## Code examples
 ```js
 var b = !!foo;
 var b = !!(foo);