chore: Clarify the compatibility requirements for Distributions

[christian-heusel]

Clarify that compatibility is about two major versions.
Related to the discussion here: kubeflow/website#4429 (comment)

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[andreyvelich]

That sounds good, thanks @christian-heusel!
/lgtm
/assign @juliusvonkohout @thesuperzapper @chasecadet @franciscojavierarceo to review
/hold

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In response to this:

That sounds good, thanks @christian-heusel!
/lgtm
/assign @juliusvonkohout @thesuperzapper @chasecadet @franciscojavierarceo to review
/hold

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[christian-heusel]

Marking this as ready to signal that the KSC can discuss/vote the proposed policy amendment / clarification. 🤗