Revert update to code block header

Reverting back to `php` as the `hack` header is likely not supported and the `php` highlighting is probably good enough (for now) to at least render the page.
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Andrew 2022-07-19 14:37:35 -04:00 committed by GitHub
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@ -11,7 +11,7 @@ filename: learnhack.hh
To run Hack code, [install HHVM](https://docs.hhvm.com/hhvm/installation/introduction), the open-source virtual machine.
```Hack
```php
/* ==================================
* READ THE DOCS!
* ==================================