Add new AWS regions for Serverless (elastic#3349)

We are releasing 2 new AWS regions:

 - London (eu-west-2)
 - Tokyo (ap-northeast-1)

Closes: elastic/platform-docs-team#690

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<img width="529" height="103" alt="rn"
src="https://github.com/user-attachments/assets/411c5913-424a-4703-8751-28d471a04735"
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<img width="534" height="354" alt="regions"
src="https://github.com/user-attachments/assets/8c230164-386b-44c8-bbbe-1efb9205d05c"
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Author: kilfoyle

deploy-manage/deploy/elastic-cloud/regions.md

@@ -26,9 +26,11 @@ The following AWS regions are currently available:
 
 | Region | Name |
 | :--- | :--- |
+| ap-northeast-1 | Asia Pacific (Tokyo) |
 | ap-southeast-1 | Asia Pacific (Singapore) |
 | eu-central-1 | Europe (Frankfurt) |
 | eu-west-1 | Europe (Ireland) |
+| eu-west-2 | Europe (London) |
 | us-east-1 | US East (N. Virginia) |
 | us-east-2 | US East (Ohio) |
 | us-west-2 | US West (Oregon) |

release-notes/elastic-cloud-serverless/index.md

@@ -9,6 +9,11 @@ products:
 # {{serverless-full}} changelog [elastic-cloud-serverless-changelog]
 Review the changes, fixes, and more to {{serverless-full}}.
 
+
+## October 15, 2025 [serverless-changelog-10152025]
+* {{serverless-full}} is now available in two new Amazon Web Services [regions](/deploy-manage/deploy/elastic-cloud/regions.md): `ap-northeast-1` (Tokyo) and `eu-west-2` (London).
+
+
 ## October 13, 2025 [serverless-changelog-10132025]
 
 ### Features and enhancements [serverless-changelog-10132025-features-enhancements]
@@ -39,6 +44,7 @@ Review the changes, fixes, and more to {{serverless-full}}.
 * Fixes an issue in the RAG Playground where invalid fields were highlighted but no error message appeared [#238284]({{kib-pull}}238284)
 * Improves the performance of the clustering algorithm [#238394]({{kib-pull}}238394)
 
+
 ## October 6, 2025 [serverless-changelog-10062025]
 
 ### Features and enhancements [serverless-changelog-10062025-features-enhancements]
@@ -80,6 +86,7 @@ Review the changes, fixes, and more to {{serverless-full}}.
 * Displays `(missing value)` and `(empty)` instead of `null` in charts and tables [#233369]({{kib-pull}}233369)
 * Fixes privilege requirements for reindexing indices in Upgrade Assistant [#237055]({{kib-pull}}237055)
 
+
 ## September 29, 2025 [serverless-changelog-09292025]
 
 ### Features and enhancements [serverless-changelog-09292025-features-enhancements]