Recommend regeneration of install-config.yaml on upgrade

[adambkaplan]

This ensures devs who re-use install-config.yaml templates deploy the latest "stable" RHCOS image.

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[wking]

#902 will obsolete this (or at least call for much different wording). @staebler, any guesses about when you can get back to that? Should we land this stop-gap in the meantime?

[wking]

#902 was carried in #1058, which landed two weeks ago. I think that obsoletes this wording, but please comment if you feel there is stuff that still needs to be documented :).

/close

[openshift-ci-robot]

@wking: Closed this PR.

In response to this:

#902 was carried in #1058, which landed two weeks ago. I think that obsoletes this wording, but please comment if you feel there is stuff that still needs to be documented :).

/close

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