chore: add alloydb-vector-search-docs to CODEOWNERS

Added @GoogleCloudPlatform/alloydb-vector-search-docs as a co-owner of the /alloydb/ directory.

Author: vinay0410

.github/CODEOWNERS

@@ -55,7 +55,7 @@
 /storagecontrol/**/*                   @GoogleCloudPlatform/gcs-sdk-team @GoogleCloudPlatform/python-samples-reviewers @GoogleCloudPlatform/cloud-samples-reviewers
 /storagetransfer/**/*                  @GoogleCloudPlatform/gcs-sdk-team @GoogleCloudPlatform/python-samples-reviewers @GoogleCloudPlatform/cloud-samples-reviewers
 # ---* Infra DB
-/alloydb/**/*                          @GoogleCloudPlatform/alloydb-connectors-code-owners @GoogleCloudPlatform/python-samples-reviewers @GoogleCloudPlatform/cloud-samples-reviewers
+/alloydb/**/*                          @GoogleCloudPlatform/alloydb-connectors-code-owners @GoogleCloudPlatform/python-samples-reviewers @GoogleCloudPlatform/cloud-samples-reviewers @GoogleCloudPlatform/alloydb-vector-search-docs
 /cloud-sql/**/*                        @GoogleCloudPlatform/cloud-sql-connectors @GoogleCloudPlatform/python-samples-reviewers @GoogleCloudPlatform/cloud-samples-reviewers
 
 # Self-service