Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: jhrozek

docs/toolhive/guides-vmcp/authentication.mdx

@@ -267,7 +267,9 @@ the Secret value.
 
 The header value must come from a Kubernetes Secret — plaintext inline values
 are not accepted at the CRD layer. Rotating the credential is a matter of
-updating the Secret; restart the affected backend pods to pick up the new value.
+updating the Secret; restart the vMCP deployment/pods, or whichever ToolHive
+workload is making the outbound requests using this `MCPExternalAuthConfig`, to
+pick up the new value.
 
 :::