Cloud: new region Saudi Arabia (#1253)

Cloud exposed new region for customers today -
https://sourcegraph.slack.com/archives/C03JR7S7KRP/p1751468128881399
This is just update in the docs.

## Pull Request approval

- [ ] @cloudyadi 
- [ ] @michaellzc

Author: filiphaftek

docs/cloud/index.mdx

@@ -89,6 +89,7 @@ Sourcegraph Cloud instances are deployed in one of Google Cloud Platform data ce
 - Europe (UK or Germany) - `europe-west2` or `europe-west3`
 - Asia (Japan) - `asia-northeast1`
 - Australia - `australia-southeast1`
+- Saudi Arabia - `me-central2`
 
 If you have specific requirements for the region, please reach out to your Sourcegraph account team.
 

public/llms.txt

@@ -17202,6 +17202,7 @@ Sourcegraph Cloud instances are deployed in one of Google Cloud Platform data ce
 - Europe (UK or Germany) - `europe-west2` or `europe-west3`
 - Asia (Japan) - `asia-northeast1`
 - Australia - `australia-southeast1`
+- Saudi Arabia - `me-central2`
 
 If you have specific requirements for the region, please reach out to your Sourcegraph account team.