docs: add information about --no-progress flag

[michalvichy]

According to: #2012

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[michalvichy]

Hey, I signed it :)

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CLAs look good, thanks!

[clydin]

All Boolean options can be prefixed with 'no-'. A general statement to that effect would probably be more appropriate.

[filipesilva]

Yeah we don't have it written down anywhere, but @clydin is right. Adding this wouldn't help as much and would make the docs a bit inconsistent.

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