update models

Author: aahill

articles/ai-services/agents/concepts/model-region-support.md

@@ -27,6 +27,7 @@ Azure AI Agent Service supports the same models as the chat completions API in A
 | francecentral | -                          | -                          | -                               | ✅                  | ✅                           | -                           | -                               | ✅ | ✅                         | ✅                          | -                          | ✅                             |
 | japaneast     | -                          | -                          | -                               | -                   | -                           | -                           | -                               | -                      | ✅                         | -                          | ✅                         | ✅                              |
 | norwayeast    |-  |  - |  - | -  | ✅ | -  |-  | -  | -  | -  | -  | - |
+| southindia    | - | - | - | - | ✅ | - | - | - | - | ✅ | ✅ | - |
 | swedencentral    | ✅ | ✅ | ✅ | ✅ | ✅ | - | ✅ | ✅ | ✅ | ✅ | - | ✅ |
 | uksouth       | -                          | -                          | -                               | -                   | ✅                          | ✅                           | -                               | -                       | ✅                          | ✅                         | ✅                          | ✅                             |
 | westus        | ✅                         | ✅                          | ✅                            | -                   | ✅                          | -                           | ✅                               | - | -                          | ✅                         | ✅                          | -                              |