OCPBUGS-54799: fixing parameter values for ABI disk encryption

Author: skopacz1

modules/installing-ocp-agent-encrypt.adoc

@@ -51,6 +51,6 @@ diskEncryption:
     mode: tang <2>
     tangServers: "server1": "http://tang-server-1.example.com:7500" <3>
 ----
-<1> Specify which nodes to enable disk encryption on. Valid values are `none`, `all`, `master`, and `worker`.
+<1> Specify which nodes to enable disk encryption on. Valid values are `none`, `all`, `masters`, and `workers`.
 <2> Specify which disk encryption mode to use. Valid values are `tpmv2` and `tang`.
 <3> Optional: If you are using Tang, specify the Tang servers.