Add trailing slash

Author: ConnorLand

content/en/docs/refguide/installation/upgrading-from-10-to-11/_index.md

@@ -75,7 +75,7 @@ Open your app in Studio Pro 11 and allow Studio Pro to update and convert your a
 
 Upgrading from Atlas 3 to Atlas 4 in Mendix 11 is an optional process, with the main structural change being the transition from SASS to CSS variables. The new system is backwards compatible with apps using SASS variables, and includes a mapping mechanism to ensure old SASS variables are mapped to CSS variable usages. 
 
-For a comprehensive, step-by-step guide on migrating your custom theme and ensuring module compatibility, please refer to our detailed documentation: [Migrating Your Mendix App to Atlas UI 4](/refguide/frontend/atlas4-migration)
+For a step-by-step guide on migrating your custom theme and ensuring module compatibility, see [Migrating Your Mendix App to Atlas UI 4](/refguide/frontend/atlas4-migration/).
 
 If you wish to opt-in, start by downloading the Atlas 4 module from the Marketplace into your app.