chore: remove experimental notice from commit signing docs (#1738)

Created by Sourcegraph Agentic Batch Changes workflow

[_Created by Sourcegraph batch change
`bahrmichael/mb-update-docs-commit-signing-experimental`._](https://sourcegraph.sourcegraph.com/users/bahrmichael/batch-changes/mb-update-docs-commit-signing-experimental)

Co-authored-by: Sourcegraph <15893131+sourcegraph-bot@users.noreply.github.com>

Author: bahrmichael

docs/admin/config/batch-changes.mdx

@@ -176,12 +176,7 @@ Batch Changes supports commit signing with both GitHub apps and with SSH keys.
 
 ### Commit signing with SSH keys (GitLab and GitHub)
 
-<Callout type="note">
-	Commit signing with SSH keys is currently Experimental and is supported only
-	with Sourcegraph v6.2 or more.
-</Callout>
-
-Commit signing with SSH keys can only be combined with a personal or fine-grained access token.
+Commit signing with SSH keys is supported with Sourcegraph v6.2 or more and can only be combined with a personal or fine-grained access token.
 
 Sourcegraph can be configured to sign commits using SSH keys with user and site admin credentials.