fix: simplifying doc

Author: abernier

docs/getting-started/authoring.mdx

@@ -45,16 +45,11 @@ Relative images are supported. Eg, inside your [`MDX`](introduction#configuratio
 title: Authoring
 ---
 
-<img src='gutenberg.jpg' />
+<img src="gutenberg.jpg" />
 ```
 
-> [!CAUTION]
-> It does not work with `src=''` (simple quotes): use `src=""` instead.
-> 
-> *It's just to show you with a relative path, without it to be resolved.*
-
 <details>
-  <summary>Result (with double quotes)</summary>
+  <summary>Result</summary>
 
 <img src="gutenberg.jpg" />