OCPBUGS-54518: Fixed codeblock to enhance clipboard experience on customize-certificates-api-add-named.adoc

Author: dfitzmau

modules/customize-certificates-api-add-named.adoc

@@ -65,8 +65,8 @@ $ oc create secret tls <secret> \//<1>
 ----
 $ oc patch apiserver cluster \
      --type=merge -p \
-     '{"spec":{"servingCerts": {"namedCertificates":
-     [{"names": ["<FQDN>"], //<1>
+     '{"spec":{"servingCerts": {"namedCertificates": \
+     [{"names": ["<FQDN>"], \//<1>
      "servingCertificate": {"name": "<secret>"}}]}}}' <2>
 ----
 <1> Replace `<FQDN>` with the FQDN that the API server should provide the certificate for. Do not include the port number.