fix: shortcode doc fixed

Author: Mikopet

content/shortcodes/index.md

@@ -159,7 +159,7 @@ The `quote` admonition.
 
 ## Gallery
 
-The `admonition()` shortcode is very simple html-only clickable picture gallery that displays all images from the page assets.
+The `gallery()` shortcode is very simple html-only clickable picture gallery that displays all images from the page assets.
 
 It's from [Zola documentation](https://www.getzola.org/documentation/content/image-processing/)