Update installation instructions for clarity (#3220)

* Update installation instructions for clarity

Clarify installation instructions for Telerik Blazor Copilot extension.

* Update ai/copilot-extension.md

Co-authored-by: Iva Stefanova Koevska-Atanasova <admatha@gmail.com>

* Update ai/copilot-extension.md

---------

Co-authored-by: Iva Stefanova Koevska-Atanasova <admatha@gmail.com>
Co-authored-by: Dimo Dimov <961014+dimodi@users.noreply.github.com>

Author: 3 people

ai/copilot-extension.md

@@ -28,6 +28,7 @@ Check [AI Coding Assistant Overview](slug:ai-overview) for more recommendations
 
 To install the Telerik Blazor Copilot extension:
 
+1. Make sure you are logged in [GitHub](https://github.com).
 1. Go to the [TelerikBlazor GitHub App](https://github.com/apps/telerikblazor) page and click the **Install** button. If you have already installed the extension, you will see a **Configure** button instead.
 1. You will see a list that includes your GitHub account and all GitHub organizations that you are part of. Normally, select your GitHub account.
 1. Click the **Install & Authorize** button. This will authorize the GitHub Copilot extension to integrate with your GitHub account.