docs: Fix (#2627)

remove redundant pipe(`|`)

Signed-off-by: nikkie <takuyafjp+develop@gmail.com>
Co-authored-by: Moritz Johner <moolen@users.noreply.github.com>

docs/provider/google-secrets-manager.md

@@ -107,5 +107,5 @@ To create a kubernetes secret from the GCP Secret Manager secret a `Kind=Externa
 
 The operator will fetch the GCP Secret Manager secret and inject it as a `Kind=Secret`
 ```
-kubectl get secret secret-to-be-created -n <namespace> | -o jsonpath='{.data.dev-secret-test}' | base64 -d
+kubectl get secret secret-to-be-created -n <namespace> -o jsonpath='{.data.dev-secret-test}' | base64 -d
 ```