rm: Remove "pull queues" from manual

[doanac]

We are deprecating pull queues in favor of push queues. This removes the references to them from our docs.

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[kprosise]

lgtm

[kprosise]

@doanac PR looks good. While it's fine for now, future doc PRs should be opened against next rather than main.

[doanac]

i have to rebase my changes anyway, so i'll push this to next instead of main

[doanac]

merged to next: f2d7b8f