Fix the max-concurrent-downloads and max-concurrent-uploads configs documentation
Fix the max-concurrent-downloads and max-concurrent-uploads configs documentation

This fix tries to address issues raised in #44346.
The max-concurrent-downloads and max-concurrent-uploads limits are applied for the whole engine and not for each pull/push command.

Signed-off-by: Luis Henrique Mulinari <38e4d32623476cd664aa6d0cb39370056ff4b0a9@gmail.com>

jimjag/docker,moby/moby,thaJeztah/docker,konstruktoid/docker-upstream,thaJeztah/docker,Ramzec/docker,Mokolea/docker,konstruktoid/docker-upstream,konstruktoid/docker-upstream,mahak/docker,jimjag/docker,thaJeztah/docker,trebonian/docker,mahak/docker,jimjag/docker,trebonian/docker,mahak/docker,moby/moby,thaJeztah/docker,Mokolea/docker,konstruktoid/docker-upstream,Ramzec/docker,Mokolea/docker,moby/moby,Ramzec/docker,Ramzec/docker,trebonian/docker,jimjag/docker,Mokolea/docker,trebonian/docker,mahak/docker,moby/moby