Change comments to not exceed 80 characters

[jeroenvisser101]

When I create a new Rails 5 project and copy over my .rubocop.yml it complains about these lines being too long. All other files seem to keep to this limit. Other generated files do keep to this, but action cable doesn't.

[rails-bot]

Thanks for the pull request, and welcome! The Rails team is excited to review your changes, and you should hear from @pixeltrix (or someone else) soon.

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[sikachu]

I think this is a good change. 👍

[jeroenvisser101]

@sikachu great :)

[jeroenvisser101]

PS. I know about #13771 (comment), but I think this should be merged because it touches generated code, not Rails internals code.

[jeroenvisser101]

Thanks :)