v4 upgrade doc, changelog for 4.0 #3557
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+112
−93
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adds 3-to-4 upgrade doc, which summarizes the relevant changes in dependencies and upgrade strategies in the chart config. I could find no changes in the chart itself that really needed upgrade docs, does anyone disagree, are there any new features we want to highlight in the upgrade doc in addition to possible breakages?
To prepare for final release, this collapses beta changelog entries into a single entry for 4.0, since I don't think we should keep changelog entries for prereleases.
I think theres some redundancy in the "version upgrade table" between the changelog and the upgrade doc. I think some redundancy is fine, but I don't have a great guide in my head for what level of info belongs where.