Update src/vendor/wordpress/jetpack-blocks.stories.mdx

Co-authored-by: Paul Hebert <paul@cloudfour.com>

Author: tylersticka

src/vendor/wordpress/jetpack-blocks.stories.mdx

@@ -8,7 +8,7 @@ WordPress developer Automattic provides a [Jetpack](https://jetpack.com/) plugin
 
 ## Markdown Block
 
-Reenforces the containing element's rhythm. If contained within a [Rhythm object](/docs/objects-rhythm--default-story), its children will inherit the same spacing.
+The markdown block applies vertical rhythm between its children. If contained within a [Rhythm object](/docs/objects-rhythm--default-story), the markdown block will inherit the same spacing. For example, if the Rhythm object uses the `o-rhythm--generous` modifier, the markdown block will inherit the generous spacing.
 
 See also: [Markdown Block documentation](https://jetpack.com/support/markdown/)