Add documentation for VS Upgrade Wizard

[boyan1742]

Related to: https://github.com/telerik/vsx/issues/2212

Since the addition of the Upgrade Wizard in Visual Studio, we would need a documentation page describing the upgrade process in VS.

Example for such page: https://www.telerik.com/aspnet-mvc/documentation/vs-integration/upgrade-wizard

[didiyordanova]

@boyan1742 this will be the docs link to the new article: https://www.telerik.com/maui-ui/documentation/installation/vs-integration/upgrade-project

[didiyordanova]

@boyan1742 the item is Done with the following PR: #1335