Say that external indexing uses the cloud (#61989)

Co-authored-by: Sophie <29382425+sophietheking@users.noreply.github.com>

Author: itsibitzi

content/copilot/concepts/context/repository-indexing.md

@@ -47,9 +47,9 @@ Once an index has been created for a repository, it can be used by:
 
 > [!TIP] There is no limit to how many repositories you can index.
 
-## Semantic indexing for non-GitHub repositories
+## Semantic indexing for non-{% data variables.product.github %} repositories
 
-{% data variables.product.prodname_copilot_short %} in {% data variables.product.prodname_vscode %} can use semantic indexing for workspace files from repositories hosted outside {% data variables.product.github %}, such as GitLab and local repositories.
+{% data variables.product.prodname_copilot_short %} in {% data variables.product.prodname_vscode %} can use semantic indexing for workspace files from repositories hosted outside {% data variables.product.github %}, such as GitLab and local repositories. This feature uploads your data to {% data variables.product.github %} to make it searchable.
 
 This feature is controlled by policy and is disabled by default. For organizations and enterprises with {% data variables.copilot.copilot_business_short %} or {% data variables.copilot.copilot_enterprise_short %}, an enterprise owner or organization owner must explicitly set the `Semantic indexing for non-GitHub repositories` policy to **Enabled** before members can use it. If the policy remains **Unconfigured**, the feature stays unavailable. See: