Fix missing closing tag for `<code-example>` 
Fix missing closing tag for `<code-example>` 

Missing closing tag for `<code-example>` is causing code block disappeared.
Fix this by adding closing tag in reference of the original source.
![](https://gyazo.com/07ac8792fbcd96c340e0d7ee899f5774)
angular/angular-ja,angular/angular-ja,angular/angular-ja