Add details about probe operation mode

[dragoangel]

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[dragoangel]

@till can you merge it please? Or something wrong with it?

[till]

@dragoangel Can you add a markdown in docs and only do additions to the prober endpoint there? There's too much in one. I'll try to re-read during the week.

Thanks for working on this, sorry about the delay.

[dragoangel]

@till what you mean by using markdown? It is already there.

[till]

Yes, put your probe additions in a new file in docs, I'll link it up later.