Fix typo in README example file name

Corrected 'big.hmtl' to 'big.html' in the usage example to ensure accurate documentation and prevent confusion.

https: //github.com/paquettg/pull/295
Co-Authored-By: Levi Durfee <10798199+levidurfee@users.noreply.github.com>

Author: mr-chetan

README.md

@@ -195,7 +195,7 @@ You can also mount a static facade for the Dom object.
 ```PHP
 PHPHtmlParser\StaticDom::mount();
 
-Dom::loadFromFile('tests/big.hmtl');
+Dom::loadFromFile('tests/big.html');
 $objects = Dom::find('.content-border');
 
 ```