docs: fix typo on Responsive Styles page (#2891)

Let's say you have a Box that looks like this:
but the example is use Text Component.

This is Typo or on purpose?

Author: dananw

website/pages/docs/features/responsive-styles.mdx

@@ -72,7 +72,7 @@ Here's how to interpret this syntax:
 You can also define responsive values with breakpoint aliases in an object. Any
 undefined alias key will define the base, non-responsive value.
 
-Let's say you have a `Box` that looks like this:
+Let's say you have a `Text` that looks like this:
 
 ```jsx live=false
 <Text fontSize="40px">This is a text</Text>