To doc: Disallow attaching ingress network

[gbarr01]

References:
https://github.com/docker/docker-ce/blob/v18.03.0-ce-rc3/CHANGELOG.md
moby/swarmkit#2523

Possible doc location:
https://docs.docker.com/network/overlay/#operations-for-standalone-containers-on-overlay-networks

[gbarr01]

@thaJeztah ... I was thinking that this needed a note for folks who actually attempted to attach an ingress network, but now I'm having 2nd thoughts per your comment that it's just a bug fix. Shall I close?

[thaJeztah]

IIUC, it's a bug fix, but it wouldn't hurt to mention somewhere that the ingress network should not be manually attached to

[gbarr01]

Actually, @thaJeztah , I see now that it's just a bug fix so if you don't mind I won't document this one. If you feel strongly about it, feel free to reopen.

[docker-robott]

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