Remove false information on Markdown content

Author: matcornic

content/cont/markdown/index.md

@@ -195,30 +195,6 @@ and this HTML:
 </blockquote>
 ```
 
-Blockquotes can also be nested:
-
-```markdown
-> Donec massa lacus, ultricies a ullamcorper in, fermentum sed augue.
-Nunc augue augue, aliquam non hendrerit ac, commodo vel nisi.
->> Sed adipiscing elit vitae augue consectetur a gravida nunc vehicula. Donec auctor
-odio non est accumsan facilisis. Aliquam id turpis in dolor tincidunt mollis ac eu diam.
-```
-
-Renders to:
-
-> Donec massa lacus, ultricies a ullamcorper in, fermentum sed augue.
-Nunc augue augue, aliquam non hendrerit ac, commodo vel nisi.
->> Sed adipiscing elit vitae augue consectetur a gravida nunc vehicula. Donec auctor
-odio non est accumsan facilisis. Aliquam id turpis in dolor tincidunt mollis ac eu diam.
-
-
-## Notices
-
-{{% notice note %}}
-The old mechanism for notices overriding the block quote syntax (`>>>`) has been deprecated.  Notices are now handled via a dedicated plugin called [Markdown Notices](https://github.com/getgrav/grav-plugin-markdown-notices)
-{{% /notice %}}
-
-
 ## Lists
 
 ### Unordered