docs: --resources replaced with --collectors in the CLI

[stigok]

This is related to #915

What this PR does / why we need it:
It corrects invalid arguments used in the docs.

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[tariq1890]

/lgtm

[tariq1890]

Thanks @stigok!

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[olivierlemasle]

@tariq1890 PR #1080 and its twin #915 made me look again at this PR...
It's should be the opposite, right? Collectors have been renamed to resources with #1006, and documentation had already been updated to reflect this change. This PR actually reverts documentation to the old name.

[tariq1890]

Oh yes, thanks so much for catching this mistake @olivierlemasle. I will make the corrections.

[stigok]

@olivierlemasle lol. Now I understand. git blame sent me here #1006

So how did I come about creating this PR? It was indeed because --resources didn't work, but --collectors did. My confusion stems from you merging v2 changes into master without bumping version. It could be nice to put up a warning about master being used to builld v2 in the readme :)

[tariq1890]

@stigok That’s a fair ask. We should update the README about breaking changes in master