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.
adambard · Jul 19, 2022 · 5c22670 · 5c22670
1 parent 19d3a49
commit 5c22670
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/hack.html.markdown b/hack.html.markdown
@@ -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!
  * ==================================