docs: add missing block boundaries

exampleSite/content/basics/customization/_index.en.md

@@ -30,6 +30,7 @@ This theme defines the following partials :
 - `content.html`: the content page itself. This can be overridden if you want to display page's meta data above or below the content.
 - `content-header.html`: header above the title, has a default implementation but you can overwrite it if you don't like it.
 - `content-footer.html`: footer below the content, has a default implementation but you can overwrite it if you don't like it.
+
 ## Change the logo
 
 Create a new file in `layouts/partials/` named `logo.html`. Then write any HTML you want.

exampleSite/content/cont/markdown.en.md

@@ -80,6 +80,7 @@ In Hugo you usually don't use `h1` as this is generated by your theme and you sh
 
 ###### h6 Heading
 {{% /notice %}}
+
 ## Horizontal Rules
 
 To further structure your content you can add horizontal rules. They create a "thematic break" between paragraph blocks. In Markdown, you can create it with three consecutive dashes `---`.