kube-ps1: add example for common pitfall (#8318)

I ran into this issue, looks like maybe a few other people did as well.

https://github.com/jonmosco/kube-ps1/issues/28#issuecomment-359761463
A simple clarification seems helpful.
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Isaac Cook 2020-02-10 13:31:55 -06:00 committed by GitHub
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@ -55,6 +55,8 @@ plugins=(
# After the "source Oh My Zsh" line
PROMPT=$PROMPT'$(kube_ps1) '
# Or in double quotes, don't forget to escape
PROMPT=$PROMPT"\$(kube_ps1) "
```
Note: The `PROMPT` example above was tested with the theme `robbyrussell`.