Update how-to-troubleshoot-online-endpoints.md

Acrolinx fix

Author: Jill Grant

articles/machine-learning/how-to-troubleshoot-online-endpoints.md

@@ -568,7 +568,7 @@ Retrying the operation after waiting several seconds up to a minute might allow
 Secret retrieval and injection during online deployment creation uses the identity associated with the online endpoint to retrieve secrets from the workspace connections and/or key vaults. This error happens when:
 
 - The endpoint identity doesn't have the Azure RBAC permission to read the secrets from the workspace connections and/or key vaults, even though the secrets were specified by the deployment definition as references (mapped to environment variables). Remember that role assignment may take time for changes to take effect.
-- The format of the secret references are invalid, or the specified secrets do not exist in the workspace connections and/or key vaults.
+- The format of the secret references is invalid, or the specified secrets do not exist in the workspace connections and/or key vaults.
 
 For more information, see [Secret injection in online endpoints (preview)](concept-secret-injection.md) and [Access secrets from online deployment using secret injection (preview)](how-to-deploy-online-endpoint-with-secret-injection.md).