OSDOCS#10265: Updated the command for adding tab completion

Author: sr1kar99

modules/cli-configuring-completion-zsh.adoc

@@ -19,6 +19,8 @@ After you install the OpenShift CLI (`oc`), you can enable tab completion to aut
 [source,terminal]
 ----
 $ cat >>~/.zshrc<<EOF
+autoload -Uz compinit
+compinit
 if [ $commands[oc] ]; then
   source <(oc completion zsh)
   compdef _oc oc