Update register-spacecraft.md

Adding more detail to eligible regions per https://github.com/MicrosoftDocs/azure-docs/issues/100961

Author: kellydevens

articles/orbital/register-spacecraft.md

@@ -43,6 +43,7 @@ Sign in to the [Azure portal](https://aka.ms/orbital/portal).
 
    > [!NOTE]
    > TLE stands for Two-Line Element.
+   > Spacecraft resources can be created in any Azure region with a Microsoft ground station and schedule contacts on any  ground station. Current eligible regions are West US 2, Sweden Central, and Southeast Asia.
 
    :::image type="content" source="media/orbital-eos-register-bird.png" alt-text="Register Spacecraft Resource Page" lightbox="media/orbital-eos-register-bird.png":::