fix typo

content/en/docs/tasks/administer-cluster/kubeadm/kubeadm-certs.md

@@ -64,7 +64,7 @@ You pass these arguments in any of the following ways:
 
 ### Approve requests
 
-If you set up an external signer such as [cert-manager][cert-manager], certificate signing requests (CRSs) are automatically approved.
+If you set up an external signer such as [cert-manager][cert-manager], certificate signing requests (CSRs) are automatically approved.
 Otherwise, you must manually approve certificates with the [`kubectl certificates`][certs] command. 
 The following kubeadm command outputs the name of the certificate to approve, then blocks and waits for approval to occur: