link with wrong destination

[Vasilis-Vr]

This issue is about https://devs.x-cart.com/misc/x-cart_classes_structure_and_namespaces.html (source file: https://github.com/xcart/xcart-docs/blob/master/_pages/devs_en/misc/x-cart_classes_structure_and_namespaces.md)

Quoting a paragraph from the page:

/classes/Controller/ directory contains definitions of classes that handle requests to X-Cart (controllers). Check general X-Cart workflow article in order to learn more about controller classes;

In the above paragraph, the link "general X-Cart workflow" links to wrong destination ("Applying changes to business logic" page). It seems that the "general X-Cart workflow" article is missing (such an article may contain very useful and important developer information).