Clarify which CSR gets automatically approved.
Clarify which CSR gets automatically approved.

commit 6912507d69af22bfb8bd49ac920ec84221b97afb added a clarifying
note that the server certificate requests must still be manually
approved somehow.  Adjust the prior text to clarify that only the node
client CSRs will be automatically approved after the first one is
approved.

Related to bug 1712268

vikram-redhat/openshift-docs,vikram-redhat/openshift-docs,vikram-redhat/openshift-docs,vikram-redhat/openshift-docs,vikram-redhat/openshift-docs