Fix small typo

Co-authored-by: Konrad Windszus <[email protected]>

README.md

@@ -377,7 +377,7 @@ A style guide for the [HTML Template Language](https://docs.adobe.com/docs/en/ht
 
   - [4.12](#4.12) <a name='4.12'></a> **Use an explicit `</sly>` end tag to close `<sly>` tags.**
 
-    Beacuse `sly` is neither a void nor a foreign element (See [html5 start tags](https://html.spec.whatwg.org/multipage/syntax.html#start-tags)), it must be explicitly closed with and end tag `</sly>`. Using a self-closing tag is **not** allowed.
+    Because `sly` is neither a void nor a foreign element (See [html5 start tags](https://html.spec.whatwg.org/multipage/syntax.html#start-tags)), it must be explicitly closed with and end tag `</sly>`. Using a self-closing tag is **not** allowed.
 
     ```html
     <!--/* Bad */-->