docs: components sample code typo

Fix typo in 'Unfold components' section: endcompontent -> endcomponent

Author: erwaen

README.md

@@ -903,7 +903,7 @@ The biggest benefit of Unfold components is the possibility to nest them inside
             Card Title
         {% endcomponent %}
     {% endcomponent %}
-{% endcompontent %}
+{% endcomponent %}
 ```
 
 Below you can find a more complex example which is using multiple components and processing them based on the passed variables from the `DASHBOARD_CALLBACK`.