docs: docker events: use tables to describe filters

[thaJeztah]

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[codecov-commenter]

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Merging #3263 (f21170d) into master (8f90d98) will not change coverage.
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[thaJeztah]

@usha-mandya ptal

[thaJeztah]

Actually, I need to improve the description, because (e.g.) --filter image=ubuntu:focal not only filters image events, but also container events for containers that use the ubuntu:focal image.

We clearly need to better document these 😞

docker system events --filter type=container --filter image=ubuntu:focal
2021-08-23T14:51:53.694424700+02:00 container create 5b924f687d7ba37303878ea3d57c3b157838eba32cd0198eb393d3685830f53a (image=ubuntu:focal, name=eager_mirzakhani)
2021-08-23T14:51:53.697756976+02:00 container attach 5b924f687d7ba37303878ea3d57c3b157838eba32cd0198eb393d3685830f53a (image=ubuntu:focal, name=eager_mirzakhani)
2021-08-23T14:51:53.986869047+02:00 container start 5b924f687d7ba37303878ea3d57c3b157838eba32cd0198eb393d3685830f53a (image=ubuntu:focal, name=eager_mirzakhani)
2021-08-23T14:51:54.006298074+02:00 container die 5b924f687d7ba37303878ea3d57c3b157838eba32cd0198eb393d3685830f53a (exitCode=0, image=ubuntu:focal, name=eager_mirzakhani)
2021-08-23T14:51:54.086801826+02:00 container destroy 5b924f687d7ba37303878ea3d57c3b157838eba32cd0198eb393d3685830f53a (image=ubuntu:focal, name=eager_mirzakhani)

Above is when running a container using that image:

docker run --rm ubuntu:focal
Unable to find image 'ubuntu:focal' locally
focal: Pulling from library/ubuntu
Digest: sha256:82becede498899ec668628e7cb0ad87b6e1c371cb8a1e597d83a47fac21d6af3
Status: Downloaded newer image for ubuntu:focal