Fix broken links in 14_ImageThumbnails.md (#217)

Author: blankse

docs/14_ImageThumbnails.md

@@ -1,8 +1,8 @@
 # Image Thumbnails
 
 To stay organized, the ToolboxBundle provides a dedicated configuration and a simple helper for image thumbnails.
-Every required thumbnail size is defined in the [toolbox configuration](https://github.com/dachcom-digital/pimcore-toolbox/blob/master/config/pimcore/image_thumbnails.yaml).
-So it's easy for you to simplify or change the [Image Thumbnail](https://www.pimcore.org/docs/5.0.0/Assets/Working_with_Thumbnails/Image_Thumbnails.html) reference. 
+Every required thumbnail size is defined in the [toolbox configuration](https://github.com/dachcom-digital/pimcore-toolbox/blob/master/config/image_thumbnails.yaml).
+So it's easy for you to simplify or change the [Image Thumbnail](https://pimcore.com/docs/platform/Pimcore/Assets/Working_with_Thumbnails/Image_Thumbnails/) reference. 
 
 Although this is just an optional feature, it makes sense to use the view helper in your project and custom bricks.
 
@@ -20,4 +20,4 @@ toolbox:
 
 ```twig
 {{ asset.getThumbnail(toolbox_get_image_thumbnail('my_thumbnail_size')) }}
-```
+```