Fix for broken link to github repo (#5587)

Link on this page generated as
`https://github.com/magento/magento2/blob2.2/app/design/frontend/Magento/blank/etc/view.xml`
which is ... well wrong.

Author: butuzov

guides/v2.2/frontend-dev-guide/themes/theme-images.md

@@ -20,7 +20,7 @@ The conventional location of `view.xml` for a theme is:
 <theme_dir>/etc/view.xml
 ```
 
-For example, here is the `view.xml` of the Magento Blank theme: [`app/design/frontend/Magento/blank/etc/view.xml`]({{ site.mage2bloburl }}{{ page.guide_version }}/app/design/frontend/Magento/blank/etc/view.xml).
+For example, here is the `view.xml` of the Magento Blank theme: [`app/design/frontend/Magento/blank/etc/view.xml`]({{ site.mage2bloburl }}/{{ page.guide_version }}/app/design/frontend/Magento/blank/etc/view.xml).
 
 In `view.xml`, image properties are configured in the scope of `<images module="Magento_Catalog">` element: