chore(cx-api): feature flags are documented incorrectly

[kaizencc]

//  !!! IMPORTANT !!!
//
//  When you introduce a new flag, set its 'introducedIn.v2' value to the literal string
// 'V2·NEXT', without the dot.
//
//  DO NOT USE A VARIABLE. DO NOT DEFINE A CONSTANT. The actual value will be string-replaced at
//  version bump time.

Well, this proved to be difficult. Some places we supplied V2·NEXT, with the dot. This PR manually updates everything back to when they were released, because we've missed the boat on the magic V2NEXT updates.

cc @corymhall for visibility, since you and I were the culprits and I was copying you :)

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[gitpod-io]

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