Update to go1.19 and format doc strings

[shoenig]

Starting with go1.19, gofmt will forcefully format your doc strings.

As part of this change, gofmt now reformats doc comments to make their rendered meaning clearer.

https://tip.golang.org/doc/go1.19#tools

Instead of having folks check in random doc strings changes in unrelated PRs, let's just rip this band-aid off during the go1.19 upgrade, formatting all files all at once.

[github-actions]

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