In my experience, this has been both an emergent behavior that has worked out well, and subsequently a culture/process that has been encouraged by management for new members (both remote and in-office) of the team.
There hasn't necessarily been a need to allocate more time for documentation, except for everyone getting in the habit of default communication modes being easily accessible documentation (common wiki/docs that all decisions, specs, and proposals go into) ... so it's not a "more time" thing, as much as it's a "don't send an email, but instead update the docs"
There hasn't necessarily been a need to allocate more time for documentation, except for everyone getting in the habit of default communication modes being easily accessible documentation (common wiki/docs that all decisions, specs, and proposals go into) ... so it's not a "more time" thing, as much as it's a "don't send an email, but instead update the docs"