Lets add 2 more examples to vast macro CLIENTUA

[ryanthompson591]

The spec isn't specific in what to do in 2 cases.

See http://interactiveadvertisingbureau.github.io/vast/vast4macros/vast4-macros-latest.html#macro-spec-clientua

1. If you have the client player but no plugin.

I suggest no delimiter, example.

MyPlayer/1.23.4

2. If you have no version.

I suggest no delimiter.

MyPlayer MyPlugin/1.2.3

I suggest we add these two examples to that section so we are on the same page.