Add graduation criteria for CapacityBuffers.

[jbtk]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Add graduation criteria for CapacityBuffers.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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[jbtk]

@ellistarn @towca

As we talked I would like to graduate the CapacityBuffers to beta soon. To ensure that there is clarity about the graduation criteria I am adding a "timeline" to the CapacityBuffers proposal.